Amethia Lo Side Effects & Health Impacts

Impacted through 2 nutrients: Vitamin B6, Folic Acid.

Impacted through 2 nutrients: Vitamin B6, Vitamin B12.

Folate deficiency in the periconceptional period significantly increases the risk of neural tube defects (NTDs) such as spina bifida and anencephaly, because adequate folate is required for proper closure of the embryonic neural tube in the first month of pregnancy. Large observational datasets and randomized trials have shown that appropriate folic acid supplementation before conception and in early pregnancy can reduce NTD risk by roughly 50–70% in the general population, with even greater risk reduction in women with a prior NTD‑affected pregnancy. The practical implication is that all women of childbearing potential, not just those actively planning pregnancy, are typically advised to maintain adequate daily folic acid intake so that red‑cell folate stores are sufficient well before conception occurs.

Research: Viswanathan M, Urrutia RP, Hudson KN, Middleton JC, Kahwati LC. Folic Acid Supplementation to Prevent Neural Tube Defects: Updated Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA. 2023;330(5):460–466. Wald NJ. Folic acid and neural tube defects: Discovery, debate and the need for policy change. J Med Screen. 2022 Sep;29(3):138-146. Mathieu d'Argent E, Ravel C, Rousseau A, Morcel K, Massin N, Sussfeld J, Simon T, Antoine JM, Mandelbaume J, Daraï E, Kolanska K. High-Dose Supplementation of Folic Acid in Infertile Men Improves IVF-ICSI Outcomes: A Randomized Controlled Trial (FOLFIV Trial). J Clin Med. 2021 Apr 26;10(9):1876. Jadhav, S. N., & Pitale, D. L. (2020). Effectiveness of folic acid in unexplained infertility. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 9(9), 3780–3783.

Low or depleted magnesium levels are associated with a higher likelihood of several cardiovascular problems, including arrhythmias, where people with low magnesium have been shown to have 2–4 times higher odds of these rhythm disturbances compared with those with normal levels. Low magnesium is also linked to worsening coronary artery disease, progression of heart failure, and development or aggravation of hypertension, driven by disrupted cardiac electrical stability, vascular function, and electrolyte balance. Even mild magnesium depletion may contribute to higher blood pressure over time, adding to the overall cardiovascular burden, especially in individuals with existing heart disease or multiple risk factors.

Research: Kolte D, Vijayaraghavan K, Khera S, Sica DA, Frishman WH. Role of magnesium in cardiovascular diseases. Cardiol Rev. 2014 Jul-Aug;22(4):182-92. Vierling W, Liebscher DH, Micke O, von Ehrlich B, Kisters K. Magnesium deficiency and therapy in cardiac arrhythmias: recommendations of the German Society for Magnesium Research. Dtsch Med Wochenschr. 2013 May;138(22):1165-71. Houston M. The role of magnesium in hypertension and cardiovascular disease. J Clin Hypertens (Greenwich). 2011 Nov;13(11):843-7. Yin Y, Costello RB, Fonarow GC, Heidenreich PA, Morgan CJ, Faselis C, Cheng Y, Zullo AR, Liu S, Lam PH, Rosanoff A, Vargas JD, Gottlieb SS, Deedwania P, Moore HJ, Shao Y, Sheriff HM, Wu WC, Zeng-Treitler Q, Ahmed A. Oral magnesium and outcomes in US veterans with heart failure. Eur Heart J. 2026 Jan 5;47(1):80-90.

In the nervous system, vitamin B6 is essential for making the inhibitory neurotransmitter GABA, so significant deficiency can lower seizure threshold and lead to seizures or encephalopathy, particularly in infants but occasionally in adults. Classic pyridoxine‑dependent or B6‑responsive seizure syndromes in infants often present with refractory seizures that improve dramatically after B6 or pyridoxal‑5‑phosphate is given, highlighting how crucial this pathway is for brain stability. Clinically, this means that in patients, especially infants, with otherwise unexplained or treatment‑resistant seizures or encephalopathy, assessing and correcting B6 status is a low‑risk, potentially lifesaving step that should be considered early.

Research: Sousou JM, Griffith EM, Marsalisi C, Reddy P. Pyridoxine Deficiency and Neurologic Dysfunction: An Unlikely Association. Cureus. 2023 Oct 25;15(10):e47647. Gerlach, A.T., Thomas, S., Stawicki, S.P., Whitmill, M.L., Steinberg, S.M., & Cook, C.H. (2011). Vitamin B6 deficiency: a potential cause of refractory seizures in adults. JPEN. Journal of parenteral and enteral nutrition, 35 2, 272-5 . Lee, D., Lee, Y., Shin, H., Kang, K., Park, J., Kim, B., Kwon, O., & Lee, J. (2015). Seizures Related to Vitamin B6 Deficiency in Adults. Journal of Epilepsy Research, 5, 23 - 24. Murty VS, Kishore MS, Patel MR. A Rare Case of Pyridoxine-dependent Seizures in Infancy. J Clin Neonatol. 2013 Jan;2(1):39-41.

In older adults, low folate status has been associated with a higher risk of mild cognitive impairment (MCI) and faster cognitive decline over time, likely through effects on one‑carbon metabolism and homocysteine. Several longitudinal cohort studies have found that individuals with lower serum or red‑cell folate and higher homocysteine show steeper declines on memory and global cognition tests, and in some cohorts have a significantly higher incidence of MCI or dementia over follow‑up. The clinically important takeaway is that, when folate deficiency is detected and corrected (usually along with ensuring adequate vitamin B12), some patients demonstrate stabilization or modest improvement in cognitive performance, particularly when interventions are combined with aggressive management of vascular risk factors such as hypertension and diabetes.

Research: Ma, F., Wu, T., Zhao, J. et al. Folic acid supplementation improves cognitive function by reducing the levels of peripheral inflammatory cytokines in elderly Chinese subjects with MCI. Sci Rep 6, 37486 (2016). Wang M, Fang M, Zang W. Effects of folic acid supplementation on cognitive function and inflammation in elderly patients with mild cognitive impairment: A systematic review and meta-analysis of randomized controlled trials. Arch Gerontol Geriatr. 2024 Nov;126:105540. O’Connor, D.M.A., Scarlett, S., De Looze, C. et al. Low folate predicts accelerated cognitive decline: 8-year follow-up of 3140 older adults in Ireland. Eur J Clin Nutr 76, 950–957 (2022).Putu Eka Widyadharma. Folic acid supplementation improves cognitive function: A systematic review. December 2020 Romanian Journal of Neurology 19(4):219-223.

Low zinc status has been linked to a higher risk and faster progression of age-related macular degeneration (AMD), in part because zinc is concentrated in the retina and supports antioxidant defenses there. In the landmark AREDS trial, a supplement formula containing zinc (80 mg as zinc oxide), along with antioxidants, reduced the risk of progression to advanced AMD by about 25% in people with intermediate disease or advanced disease in one eye over roughly 5 years. Other research has shown that inadequate zinc intake is more common in older adults with AMD, reinforcing the idea that maintaining healthy zinc levels may be an important, and often overlooked, strategy for preserving macular health with age.

Research: Smailhodzic D, van Asten F, Blom AM, Mohlin FC, den Hollander AI, van de Ven JPH, et al. (2014) Zinc Supplementation Inhibits Complement Activation in Age-Related Macular Degeneration. PLoS ONE 9(11): e112682. Lengyel D, Török B. Erworbene vorübergehende Nachtblindheit bei Vitamin-A- und Zinkmangel bei Anorexia nervosa neun Jahre nach Nierentransplantation [Acquired temporary night blindness in vitamin A and zinc deficiency in anorexia nervosa nine years after kidney transplantation]. Klin Monbl Augenheilkd. 2006 May;223(5):453-5. German.Blasiak J, Pawlowska E, Chojnacki J, Szczepanska J, Chojnacki C, Kaarniranta K. Zinc and Autophagy in Age-Related Macular Degeneration. Int J Mol Sci. 2020 Jul 15;21(14):4994. Benjamin P. Nicholson, et al. Chapter 37 - Zinc Deficiency and the Eye. Handbook of Nutrition, Diet and the Eye 2014, Pages 371-376.

Low or deficient vitamin B12 status elevates homocysteine levels by impairing its conversion to methionine, a process that requires B12 as a cofactor. This hyperhomocysteinemia is linked to increased cardiovascular risks, including atherosclerosis, heart disease, and stroke, through vascular inflammation and endothelial damage. Additionally, low B12 contributes to metabolic disturbances like insulin resistance and type 2 diabetes risk, compounding heart health concerns in susceptible individuals.

Research: Sucharita S, Thomas T, Antony B, Vaz M. Vitamin B12 supplementation improves heart rate variability in healthy elderly Indian subjects. Auton Neurosci. 2012 May 21;168(1-2):66-71. Al-Daghri NM, Rahman S, Sabico S, Yakout S, Wani K, Al-Attas OS, Saravanan P, Tripathi G, McTernan PG, Alokail MS. Association of Vitamin B12 with Pro-Inflammatory Cytokines and Biochemical Markers Related to Cardiometabolic Risk in Saudi Subjects. Nutrients. 2016 Sep 6;8(9):460. Eken, Y.; Tekin, N.; Şahin, F.; Tay, İ.; Yıldırım Saral, N.; Serteser, M.; Baykal, A.T. Vitamin B12 Status and Cardiovascular Risk: Novel Insights from NMR-Based Lipoprotein Profiling in 20,665 Adults. J. Clin. Med. 2026. Liu Y, Geng T, Wan Z, Lu Q, Zhang X, Qiu Z, Li L, Zhu K, Liu L, Pan A, Liu G. Associations of Serum Folate and Vitamin B12 Levels With Cardiovascular Disease Mortality Among Patients With Type 2 Diabetes. JAMA Netw Open. 2022 Jan 4;5(1):e2146124.

Impacted through 2 nutrients: Vitamin B12, Magnesium.

Vitamin C deficiency weakens collagen in capillary and vascular walls, so severe scurvy can present with ocular hemorrhages in the conjunctiva and retina that threaten vision if not treated. Case reports and small series describe retinal hemorrhages, flame‑shaped hemorrhages, and even retrobulbar bleeding compressing the optic nerve, which can lead to optic neuropathy and visual loss in advanced cases. The encouraging point is that, when vitamin C deficiency is recognized early and promptly repleted, many ocular hemorrhages and visual symptoms can partially or fully resolve, making it critical to consider vitamin C status in patients with otherwise unexplained ocular bleeding and visual complaints.

Research: Errera MH, Dupas B, Man H, Gualino V, Gaudric A, Massin P. Une cause inhabituelle d'anomalies rétiniennes, hémorragies rétiniennes révélatrices de scorbut [Unusual retinal abnormality: retinal hemorrhages related to scurvy]. J Fr Ophtalmol. 2011 Mar;34(3):186.e1-3. Masuda Y, Saigusa K, Norisue Y. A Case of Scurvy Associated With Intracerebral Hemorrhage in a Patient With Alcohol Use Disorder. Cureus. 2024 Feb 23;16(2):e54777. Andrew Go Lee, et al. Ocular Manifestations of Vitamin C Deficiency. American Academy of Opthamology. November 2025. A. Martel, et al. Spontaneous eyelid and subconjunctival socket bleeding related to vitamin C deficiency: First case reportHémorragie palpébrale et sous conjonctivale spontanée sur cavité anophtalme secondaire à un déficit en vitamine C : premier cas rapporté. Journal Français d'Ophtalmologie. Volume 43, Issue 9, November 2020.

Low or depleted magnesium levels place people with diabetes and metabolic syndrome (MetSyn) at higher risk of worsening glycemic control and insulin resistance because magnesium is essential for normal glucose metabolism and beta-cell function. When magnesium is low, these metabolic pathways become less efficient, amplifying blood sugar instability, lipid abnormalities, and other MetSyn features. Even moderate depletion can accelerate type 2 diabetes and MetSyn-related complications, underscoring the need for monitoring magnesium status in these vulnerable groups.

Research: Gommers LM, Hoenderop JG, Bindels RJ, de Baaij JH. Hypomagnesemia in Type 2 Diabetes: A Vicious Circle? Diabetes. 2016 Jan;65(1):3-13. Ozcaliskan Ilkay H, Sahin H, Tanriverdi F, Samur G. Association Between Magnesium Status, Dietary Magnesium Intake, and Metabolic Control in Patients with Type 2 Diabetes Mellitus. J Am Coll Nutr. 2019 Jan;38(1):31-39. Mooren FC. Magnesium and disturbances in carbohydrate metabolism. Diabetes Obes Metab. 2015 Sep;17(9):813-23. Paladiya R, Pitliya A, Choudhry AA, Kumar D, Ismail S, Abbas M, Naz S, Kumar B, Jamil A, Fatima A. Association of Low Magnesium Level With Duration and Severity of Type 2 Diabetes. Cureus. 2021 May 27;13(5):e15279. Ju SY, Choi WS, Ock SM, Kim CM, Kim DH. Dietary magnesium intake and metabolic syndrome in the adult population: dose-response meta-analysis and meta-regression. Nutrients. 2014 Dec 22;6(12):6005-19.

Magnesium depletion can contribute to neurological issues like migraines, depression, seizures, and cognitive impairment by disrupting neuronal excitability, neurotransmitter balance, and NMDA receptor function. Case reports often describe severe symptoms such as tremors, encephalopathy, cerebellar ataxia, or memory problems in affected patients, which typically resolve once magnesium levels are restored. Although these effects occur less frequently than cardiovascular complications, monitoring is advisable particularly in older adults with persistent low magnesium.

Research: Chen F, Wang J, Cheng Y, Li R, Wang Y, Chen Y, Scott T, Tucker KL. Magnesium and Cognitive Health in Adults: A Systematic Review and Meta-Analysis. Adv Nutr. 2024 Aug;15(8):100272. Kumar A, Mehan S, Tiwari A, Khan Z, Gupta GD, Narula AS, Samant R. Magnesium (Mg2+): Essential Mineral for Neuronal Health: From Cellular Biochemistry to Cognitive Health and Behavior Regulation. Curr Pharm Des. 2024;30(39):3074-3107. Varga P, Lehoczki A, Fekete M, Jarecsny T, Kryczyk-Poprawa A, Zábó V, Major D, Fazekas-Pongor V, Csípő T, Varga JT. The Role of Magnesium in Depression, Migraine, Alzheimer's Disease, and Cognitive Health: A Comprehensive Review. Nutrients. 2025 Jul 4;17(13):2216. Mauskop A, Varughese J. Why all migraine patients should be treated with magnesium. J Neural Transm (Vienna). 2012 May;119(5):575-9.

In susceptible adults, acute thiamine (vitamin B1) deficiency can rapidly trigger an encephalopathy marked by confusion, gait ataxia, and ocular motor abnormalities such as nystagmus or ophthalmoplegia. This classic triad is often incomplete at presentation, and only a minority of patients show all three features together initially, which contributes to delayed diagnosis. Because body stores are quickly exhausted, maintaining adequate ongoing thiamine intake is critical, and can reverse many of the acute neurologic signs if started early, whereas even short delays increase the risk of persistent cognitive impairment and structural brain injury on imaging.

Research: Yin H, Xu Q, Cao Y, Qi Y, Yu T, Lu W. Nonalcoholic Wernicke's encephalopathy: a retrospective study of 17 cases. J Int Med Res. 2019 Oct;47(10):4886-4894. Isenberg-Grzeda E, Alici Y, Hatzoglou V, Nelson C, Breitbart W. Nonalcoholic Thiamine-Related Encephalopathy (Wernicke-Korsakoff Syndrome) Among Inpatients With Cancer: A Series of 18 Cases. Psychosomatics. 2016 Jan-Feb;57(1):71-81. Clark AF. Use of Thiamine Supplementation in Pregnant Women Diagnosed With Hyperemesis Gravidarum and Wernicke Encephalopathy. Nurs Womens Health. 2024 Jun;28(3):222-226. Bento MA, Vieira JB, Silva ML and Camolas J (2024) Case report: Wernicke–Korsakoff syndrome after bariatric surgery. Front. Nutr. 10:1321275.

In both children and adults, vitamin E deficiency can contribute to retinopathy and visual impairment because α‑tocopherol serves as a key fat‑soluble antioxidant that protects photoreceptor cells and retinal membranes from cumulative oxidative damage. Clinical reports describe patients with prolonged low vitamin E status developing pigmentary retinopathy, reduced visual acuity, and abnormal electroretinograms, sometimes alongside peripheral neuropathy, which can improve partially when deficiency is identified and corrected. These neurosensory changes appear more frequently in settings of fat malabsorption or genetic disorders affecting vitamin E transport, highlighting the importance of monitoring vitamin E status in at‑risk groups with otherwise unexplained visual decline.

Research: Runge P, Muller DP, McAllister J, Calver D, Lloyd JK, Taylor D. Oral vitamin E supplements can prevent the retinopathy of abetalipoproteinaemia. Br J Ophthalmol. 1986 Mar;70(3):166-73. Pang J, Kiyosawa M, Seko Y, Yokota T, Harino S, Suzuki J. Clinicopathological report of retinitis pigmentosa with vitamin E deficiency caused by mutation of the alpha-tocopherol transfer protein gene. Jpn J Ophthalmol. 2001 Nov-Dec;45(6):672-6. Edwards G, Olson CG, Euritt CP, Koulen P. Molecular Mechanisms Underlying the Therapeutic Role of Vitamin E in Age-Related Macular Degeneration. Front Neurosci. 2022 May 4;16:890021. Ng EY, Chiew Y, Phang SCW, Ng YT, Tan GCJ, et al. (2021) The Effects of Vitamin E on Non-proliferative Diabetic Retinopathy in Type 2 Diabetes Mellitus. Int J Diabetes Clin Res 8:142.

Impacted through 3 nutrients: Folic Acid, Zinc, Vitamin B12.

In pregnancy, inadequate folate status not only increases neural tube defect risk but is also associated with maternal megaloblastic anemia, which can worsen fatigue, reduce exercise tolerance, and increase the likelihood of transfusion around delivery. Observational studies have linked low folate and elevated homocysteine with a higher risk of miscarriage, placental complications, and low birth weight, and some data suggest that suboptimal folate status may contribute to certain infertility contexts, particularly when combined with other nutritional or metabolic stressors. The clinical takeaway is that maintaining sufficient folate intake before conception and throughout pregnancy is a key strategy to reduce anemia and support healthier fertility and pregnancy outcomes beyond neural tube defect prevention.

Research: Murto, T. et al. Folic acid supplementation and IVF pregnancy outcome in women with unexplained infertility. Dey M, Dhume P, Sharma SK, Goel S, Chawla S, Shah A, Madhumidha G, Rawal R. Folic acid: The key to a healthy pregnancy - A prospective study on fetomaternal outcome. Tzu Chi Med J. 2023 Oct 31;36(1):98-102. Hariz A, Bhattacharya PT. Megaloblastic Anemia. [Updated 2023 Apr 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan. Lazar VMA, Rahman S, Chowdhury NH, Hasan T, Akter S, Islam MS, Ahmed S, Baqui AH, Khanam R. Folate deficiency in pregnancy and the risk of preterm birth: A nested case-control study. J Glob Health. 2024 Jul 12;14:04120. Zheng J-S, Guan Y, Zhao Y, et al. Pre-conceptional intake of folic acid supplements is inversely associated with risk of preterm birth and small-for-gestational-age birth: a prospective cohort study. British Journal of Nutrition. 2016;115(3):509-516. Reproductive BioMedicine Online, Volume 28, Issue 6, 766 - 772

Closely linked to reproductive and hormonal problems in both men and women, zinc deficiency can contribute to hypogonadism, low testosterone, reduced sperm count, and menstrual irregularities. In men, low zinc status has been associated with decreased serum testosterone, reduced sperm density and motility, and poorer overall semen quality, while zinc repletion in deficient individuals has been shown to improve some of these parameters. In women, inadequate zinc intake is tied to more frequent cycle disturbances, dysmenorrhea, and potential impacts on ovulation and fertility, underscoring zinc’s important role in healthy hormonal balance and reproductive function.

Research: Zhao J, Dong X, Hu X, Long Z, Wang L, Liu Q, Sun B, Wang Q, Wu Q, Li L. Zinc levels in seminal plasma and their correlation with male infertility: A systematic review and meta-analysis. Sci Rep. 2016 Mar 2;6:22386. Mohan H, Verma J, Singh I, Mohan P, Marwah S, Singh P. Inter-relationship of zinc levels in serum and semen in oligospermic infertile patients and fertile males. Indian J Pathol Microbiol. 1997 Oct;40(4):451-5. PMID: 9444854. Zečević N, Veselinović A, Perović M, Stojsavljević A. Association Between Zinc Levels and the Impact of Its Deficiency on Idiopathic Male Infertility: An Up-to-Date Review. Antioxidants (Basel). 2025 Jan 29;14(2):165. Dhar S, Yadav R, Tomar A. Serum Zinc Levels in Women with Polycystic Ovarian Syndrome are Lower as Compared to Those without Polycystic Ovarian Syndrome: A Cohort Study. J Hum Reprod Sci. 2024 Jan-Mar;17(1):25-32.

When vitamin C runs low, its impact isn’t just skin‑deep, it can also affect the heart and lungs, sometimes contributing to shortness of breath, fatigue, and fluid retention. Severe vitamin C deficiency has been reported as a reversible cause of pulmonary hypertension and right‑sided heart failure, with pressures in the lung circulation and cardiac strain improving after vitamin C is replaced. Broader cardiovascular research also links low vitamin C with higher blood pressure and stiffer arteries, while short‑term supplementation in some hypertensive or diabetic patients has lowered systolic blood pressure and improved arterial stiffness, suggesting that adequate vitamin C helps support healthier vascular tone and cardiac workload.

Research: Kurnick A, Zaveri S, Tadayoni A, Chandrakumar HP, John S. Reversible severe pulmonary hypertension and right heart failure with cardiogenic shock due to scurvy: a case report. Eur Heart J Case Rep. 2023 Aug 17;7(8):ytad404. Duvall MG, Pikman Y, Kantor DB, Ariagno K, Summers L, Sectish TC, Mullen MP. Pulmonary hypertension associated with scurvy and vitamin deficiencies in an autistic child. Pediatrics. 2013 Dec;132(6):e1699-703. Abe K, Kibe R, David K, Reddy V, Allard B, Fakaosita M. Reversible right-sided heart failure and pulmonary hypertension caused by scurvy in a 7-year-old boy with autism spectrum disorder and a review of the literature. Paediatr Int Child Health. 2023 Nov;43(4):95-99. Conte L, Louden J, Weber LA. Multivalve dysfunction and cardiogenic shock linked to scurvy: A case report. Anatol J Cardiol. 2021 May;25(5):355-359.

Impaired renal magnesium reabsorption from low or depleted magnesium levels carries a notable association with worse kidney outcomes, shown by adjusted odds ratios of 1.7–3.0 in affected patients. This contributes to electrolyte imbalances and may worsen overall kidney function over time, with studies reporting hypomagnesemia in nearly a quarter of patients who already have impaired renal function. Monitoring renal function and magnesium status remains crucial for at-risk individuals to avert complications such as acute kidney injury or hospitalization.

Research: Ferrè S, Li X, Adams-Huet B, Maalouf NM, Sakhaee K, Toto RD, Moe OW, Neyra JA. Low serum magnesium is associated with faster decline in kidney function: the Dallas Heart Study experience. J Investig Med. 2019 Aug;67(6):987-994.Steven Van Laecke, Wim Van Biesen, Raymond Vanholder, Hypomagnesaemia, the kidney and the vessels, Nephrology Dialysis Transplantation, Volume 27, Issue 11, November 2012, Pages 4003–4010. Sarah Cascaes Alves, Cristiane Damiani Tomasi, Larissa Constantino, Vinícius Giombelli, Roberta Candal, Maria de Lourdes Bristot, Maria Fernanda Topanotti, Emmanuel A. Burdmann, Felipe Dal-Pizzol, Cassiana Mazon Fraga, Cristiane Ritter, Hypomagnesemia as a risk factor for the non-recovery of the renal function in critically ill patients with acute kidney injury, Nephrology Dialysis Transplantation, Volume 28, Issue 4, April 2013, Pages 910–916. Liu Z, Wang R, He M, Kang Y. Hypomagnesemia Is Associated with the Acute Kidney Injury in Traumatic Brain Injury Patients: A Pilot Study. Brain Sci. 2023 Mar 31;13(4):593.

In some adults, significant thiamine (vitamin B1) deficiency can drive a hypermetabolic, vasodilated state with lactic acidosis, tachycardia, warm edema, and high‑output heart failure rather than the “typical” low‑output picture. Clinically, this pattern—often referred to as wet beriberi—can progress over days to weeks from exertional dyspnea and bounding pulses to hypotension and overt cardiovascular collapse if thiamine is not repleted. The encouraging part is that, when recognized in time, aggressive intravenous thiamine supplementation can produce striking hemodynamic improvement within hours, underscoring how crucial it is to maintain adequate ongoing thiamine intake in at‑risk patients.

Research: Hayek A, Djabou M, Mewton N, Bonnefoy-Cudraz E, Bochaton T. Thiamine Deficiency as a Cause for Acute Circulatory Failure: An Overlooked Association in Western Countries. CJC Open. 2020 Jul 19;2(6):716-718. Blanc P, Henriette K, Boussuges A. Severe metabolic acidosis and heart failure due to thiamine deficiency. Nutrition. 2002 Jan;18(1):118. Durstenfeld MS, Hsue PY. An Unusual, Reversible Cause of Acute High-Output Heart Failure Complicated by Refractory Shock. Circulation. 2020 Sep;142(9):901-905.Alamro Y, Arshad K, Latif R, Al Akeel M, Mozaffari MA. From Collapse to Recovery: Thiamine Intervention in Cardiac Beriberi. Cureus. 2024 Feb 14;16(2):e54179.

In adults with prolonged thiamine (vitamin B1) deficiency, an axonal polyneuropathy can develop that causes distal weakness, areflexia, and sensory loss that is typically more pronounced in the lower than the upper limbs. Clinicians often describe this “dry beriberi” neuropathy as starting with burning paresthesias and numbness in the feet, then ascending proximally over weeks to months as motor involvement and gait impairment emerge. The hopeful aspect is that timely and adequate thiamine repletion can halt progression and partially reverse neurologic deficits, especially when treatment begins before severe axonal loss and muscle wasting are established.

Research: Nisar S, Yousuf Wani I, Altaf U, Muzaffer U, Kareem O, Tanvir M, Ganie MA. Thiamine deficiency-related neuropathy: A reversible entity from an endemic area. Eur J Neurol. 2024 Mar;31(3):e16155. Shible AA, Ramadurai D, Gergen D, Reynolds PM. Dry Beriberi Due to Thiamine Deficiency Associated with Peripheral Neuropathy and Wernicke's Encephalopathy Mimicking Guillain-Barré syndrome: A Case Report and Review of the Literature. Am J Case Rep. 2019 Mar 13;20:330-334. Hamel JI, Logigian EL. Clinical Spectrum and Prognosis in Patients With Acute Nutritional Axonal Neuropathy. Neurology. 2023 May 16;100(20):e2134-e2140. Staff NP, Windebank AJ. Peripheral neuropathy due to vitamin deficiency, toxins, and medications. Continuum (Minneap Minn). 2014 Oct;20(5 Peripheral Nervous System Disorders):1293-306.

Impacted through 2 nutrients: Vitamin B6, Folic Acid.

In some adults, vitamin B6 deficiency can manifest as a distal, symmetric peripheral neuropathy that is predominantly sensory rather than motor, with numbness, tingling, or burning pain starting in the feet and hands. Clinical descriptions note that this large‑fiber neuropathy often produces loss of vibration and position sense with relatively preserved pain and temperature sensation, which can lead to sensory ataxia and gait unsteadiness in more advanced cases. The practical point is that, because both B6 deficiency and excess can cause peripheral neuropathy, it is important to assess B6 status in patients with otherwise unexplained distal sensory symptoms and to correct deficiencies.

Research: Miguel Chuquilin Arista, et al. Pyridoxine Deficiency in Patients with Peripheral Neuropathy Symptoms. Neurology Journals. A Case Series (P01.137). February 12, 2013 issue 80 (7_supplement) P01.137. Sawhney A, Singhal S, Patel R (July 10, 2022) Isolated Pyridoxine Deficiency Presenting as Peripheral Neuropathy Post-chemotherapy. Cureus 14(7): e26725. Renting L, Zwart NRK, Ueland PM, McCann A, Ulvik A, van Halteren HK, et al. Vitamin B6 status and chronic chemotherapy-induced peripheral neuropathy: a prospective cohort study among patients with non-metastatic colorectal cancer receiving oxaliplatin-based chemotherapy. BMJ Oncology. 2024;3:e000462

Impacted through 3 nutrients: Zinc, Vitamin C, Vitamin E.

Zinc deficiency during childhood and adolescence is strongly linked to impaired linear growth and delayed sexual maturation, and is a recognized contributor to stunting in many low‑ and middle‑income countries. In some population studies, zinc deficiency has been present in over 30–40% of children, and zinc supplementation programs have been associated with modest but meaningful improvements in height gain over time. Clinically, even marginal zinc deficiency can quietly slow growth velocity and pubertal progression, making adequate zinc intake an important, often overlooked pillar of healthy growth and development.

Research: Abdollahi M, Ajami M, Abdollahi Z, Kalantari N, Houshiarrad A, Fozouni F, Fallahrokni A, Mazandarani FS. Zinc supplementation is an effective and feasible strategy to prevent growth retardation in 6 to 24 month children: A pragmatic double blind, randomized trial. Heliyon. 2019 Nov 1;5(11):e02581. Walravens PA, Krebs NF, Hambidge KM. Linear growth of low income preschool children receiving a zinc supplement. Am J Clin Nutr. 1983 Aug;38(2):195-201. Rerksuppaphol S, Rerksuppaphol L. Zinc supplementation enhances linear growth in school-aged children: A randomized controlled trial. Pediatr Rep. 2018 Jan 4;9(4):7294. Zinc deficiency as risk factor for stunting among children aged 2-5 years. (2017). Universa Medicina, 36(1), 11-18.

Magnesium depletion undermines healthy aging by disrupting key hallmarks like mitochondrial dysfunction, chronic inflammation, genomic instability, and autophagy, which impair cellular resilience and multisystem longevity. Even beyond specific risks in cardio, metabolic, renal, bone, and neuro categories, mild hypomagnesemia compounds broader age-related vulnerabilities, accelerating frailty and reduced healthspan in older adults. Observational data and mechanistic studies highlight consistent multisystem impacts in elderly individuals with low magnesium.

Research: de Baaij JH, Hoenderop JG, Bindels RJ. Magnesium in man: implications for health and disease. Physiol Rev. 2015 Jan;95(1):1-46. Dominguez LJ, Veronese N, Barbagallo M. Magnesium and the Hallmarks of Aging. Nutrients. 2024 Feb 9;16(4):496. Barbagallo, M., Dominguez, L.J. (2018). Magnesium Role in Health and Longevity. In: Malavolta, M., Mocchegiani, E. (eds) Trace Elements and Minerals in Health and Longevity. Healthy Ageing and Longevity, vol 8. Springer, Cham. Matek Sarić M, Sorić T, Juko Kasap Ž, Lisica Šikić N, Mavar M, Andruškienė J, Sarić A. Magnesium: Health Effects, Deficiency Burden, and Future Public Health Directions. Nutrients. 2025 Nov 20;17(22):3626.

Magnesium depletion can contribute to obesity through disrupted metabolic signaling, insulin sensitivity, and gut microbiota shifts that favor fat storage. Low magnesium impairs energy homeostasis and promotes low-grade inflammation, potentially worsening weight gain in susceptible individuals, especially those with poor diets. Mechanistic and observational links, though not yet confirmed by large RCTs, support monitoring body composition to address this reversible concern.

Research: Al Shammaa A, Al-Thani A, Al-Kaabi M, Al-Saeed K, Alanazi M, Shi Z. Serum Magnesium is Inversely Associated with Body Composition and Metabolic Syndrome. Diabetes Metab Syndr Obes. 2023 Jan 12;16:95-104. Lu L, Chen C, Yang K, Zhu J, Xun P, Shikany JM, He K. Magnesium intake is inversely associated with risk of obesity in a 30-year prospective follow-up study among American young adults. Eur J Nutr. 2020 Dec;59(8):3745-3753. Oliveira AR, Cruz KJ, Severo JS, Morais JB, Freitas TE, Araújo RS, Marreiro DD. Hypomagnesemia and its relation with chronic low-grade inflammation in obesity. Rev Assoc Med Bras (1992). 2017 Feb;63(2):156-163. Cazzola R, Della Porta M, Piuri G, Maier JA. Magnesium: A Defense Line to Mitigate Inflammation and Oxidative Stress in Adipose Tissue. Antioxidants (Basel). 2024 Jul 24;13(8):893.

Thiamine (vitamin B1) deficiency can quietly undermine attention, memory, and executive function because several thiamine‑dependent enzymes are essential for the brain’s energy production and for healthy cholinergic signaling. Human studies have shown marked neuron loss in the mediodorsal thalamus and hippocampal atrophy in severe deficiency states, and the degree of this structural damage tracks closely with how impaired a person is on memory and other cognitive tests. Thiamine is also required for the biosynthesis of acetylcholine, a neurotransmitter crucial for learning and memory, so reduced cholinergic input to the hippocampus and frontal cortex further amplifies attention and memory problems when deficiency is prolonged.

Research: Behura SS, Swain SP. Neuropsychological functioning in Wernicke's encephalopathy. Ind Psychiatry J. 2015 Jan-Jun;24(1):99-103. Batarfi MA. Thiamine Deficiency and Brain Injury: Neuroanatomical Changes in the Wernicke-Korsakoff Syndrome. Cureus. 2025 Sep 18;17(9):e92643.Gibson GE, Hirsch JA, Fonzetti P, Jordan BD, Cirio RT, Elder J. Vitamin B1 (thiamine) and dementia. Ann N Y Acad Sci. 2016 Mar;1367(1):21-30. Teixeira J, Pereira I, Castanho M, Simões do Couto F. What is the impact of thiamine deficiency on cognitive function in patients with alcohol use disorder? - A systematic review. Eur J Intern Med. 2025 Apr;134:59-65.

The pancreas normally concentrates thiamine (vitamin B1) and tightly regulates its uptake, reflecting how important this vitamin is for insulin synthesis and secretion. Experimental studies in animals and islet models show that thiamine deficiency markedly impairs glucose oxidation and insulin release, while human data consistently find that people with diabetes tend to have significantly lower thiamine levels and higher urinary thiamine losses than those without diabetes. Taken together, these findings suggest that low thiamine status may worsen glycemic control and increase susceptibility to hyperglycemia by limiting insulin production and secretion.

Research: Alaei Shahmiri F, Soares MJ, Zhao Y, Sherriff J. High-dose thiamine supplementation improves glucose tolerance in hyperglycemic individuals: a randomized, double-blind cross-over trial. Eur J Nutr. 2013 Oct;52(7):1821-4. Luong KV, Nguyen LT. The impact of thiamine treatment in the diabetes mellitus. J Clin Med Res. 2012 Jun;4(3):153-60. Luong KV, Nguyen LT. The impact of thiamine treatment in the diabetes mellitus. J Clin Med Res. 2012 Jun;4(3):153-60. Ziegler D, Reiners K, Strom A, Obeid R. Association between diabetes and thiamine status - A systematic review and meta-analysis. Metabolism. 2023 Jul;144:155565.

Vitamin E deficiency can drive a progressive neurologic syndrome, including ataxia, sensory neuropathy, and myelopathy, because α‑tocopherol is a critical fat‑soluble antioxidant that protects neuronal membranes and prevents peroxidation of polyunsaturated fatty acids under oxidative stress. In both children with chronic cholestatic liver disease and adults without obvious fat malabsorption, low vitamin E status has been linked to characteristic large‑fiber sensory axonopathy and other degenerative changes, illustrating that unrecognized deficiency can present with strikingly “neurologic‑first” symptoms. When vitamin E deficiency is identified early, appropriately dosed, bioavailable α‑tocopherol supplementation can stabilize or partially reverse neurologic findings in some patients, underscoring the importance of screening at‑risk groups and not dismissing isolated ataxia or neuropathy as purely genetic or idiopathic.

Research: Sokol RJ, Butler-Simon N, Conner C, Heubi JE, Sinatra FR, Suchy FJ, Heyman MB, Perrault J, Rothbaum RJ, Levy J, et al. Multicenter trial of d-alpha-tocopheryl polyethylene glycol 1000 succinate for treatment of vitamin E deficiency in children with chronic cholestasis. Gastroenterology. 1993 Jun;104(6):1727-35. Bonello M, Ray P. A Case of Ataxia with Isolated Vitamin E Deficiency Initially Diagnosed as Friedreich's Ataxia. Case Rep Neurol Med. 2016;2016:8342653. Agarwal A, Garg D, Srivastava AK. Ataxia with Vitamin E Deficiency: A Never to be Missed Treatable Ataxia. Ann Indian Acad Neurol. 2023 Nov-Dec;26(6):1011-1012. Chan KH, O'Sullivan M, Farouji I, Are G, Slim J. Sensory Axonopathy Associated With Vitamin E Deficiency. Cureus. 2021 Feb 17;13(2):e13389.

Vitamin E deficiency can present as a predominantly neuromuscular picture, in which slowly progressive peripheral neuropathy (often large‑fiber, length‑dependent, and sensory‑predominant) coexists with proximal muscle weakness and myopathy due to ongoing oxidative damage to peripheral nerves and muscle cell membranes. In reported series, patients have developed areflexia, gait instability, distal numbness, and reduced vibration sense along with elevated creatine kinase or myopathic changes on EMG, sometimes after years of unrecognized low vitamin E status rather than an obvious malabsorption syndrome. When deficiency is documented and α‑tocopherol is repleted with an adequately absorbed preparation, some individuals show meaningful improvements in strength, sensory symptoms, and electrophysiologic measures, highlighting that peripheral neuropathy and myopathy attributed to “idiopathic” or purely degenerative causes may in fact be partially reversible when vitamin E deficiency is identified and treated.

Research: Puri, V., Chaudhry, N., Tatke, M. and Prakash, V. (2005), Isolated vitamin E deficiency with demyelinating neuropathy. Muscle Nerve, 32: 230-235. Martinello F, Fardin P, Ottina M, Ricchieri GL, Koenig M, Cavalier L, Trevisan CP. Supplemental therapy in isolated vitamin E deficiency improves the peripheral neuropathy and prevents the progression of ataxia. J Neurol Sci. 1998 Apr 1;156(2):177-9. Hegele RA, Angel A. Arrest of neuropathy and myopathy in abetalipoproteinemia with high-dose vitamin E therapy. Can Med Assoc J. 1985 Jan 1;132(1):41-4. Sokol RJ, Butler-Simon N, Heubi JE, Iannaccone ST, McClung HJ, Accurso F, Hammond K, Heyman M, Sinatra F, Riely C, et al. Vitamin E deficiency neuropathy in children with fat malabsorption. Studies in cystic fibrosis and chronic cholestasis. Ann N Y Acad Sci. 1989;570:156-69.

In high‑risk settings such as prematurity or chronic fat malabsorption, vitamin E deficiency can contribute to hemolytic anemia because α‑tocopherol is a fat‑soluble antioxidant that keeps red blood cell membranes more stable under everyday oxidative stress. By helping prevent damage to the polyunsaturated fatty acids in these membranes, vitamin E lowers the chance that red blood cells will break apart too early, which can otherwise show up as fatigue, pallor, jaundice, and lab evidence of anemia. In very low birth‑weight infants and in people with long‑standing fat‑absorption problems, spotting low vitamin E levels early and using a well‑absorbed natural Vitamin E supplement can meaningfully reduce hemolysis risk and support healthier hemoglobin levels over time.

Research: Jilani T, Iqbal MP. Does vitamin E have a role in treatment and prevention of anemia? Pak J Pharm Sci. 2011 Apr;24(2):237-42. Gomez-Pomar E, Hatfield E, Garlitz K, Westgate PM, Bada HS. Vitamin E in the Preterm Infant: A Forgotten Cause of Hemolytic Anemia. Am J Perinatol. 2018 Feb;35(3):305-310. Gross, S., Landaw, S. & Oski, F. The effects of vitamin E on hemolysis in premature infants during the first week of life. Pediatr Res 11, 472 (1977).Jilani T, Iqbal MP. Vitamin E deficiency in South Asian population and the therapeutic use of alpha-tocopherol (Vitamin E) for correction of anemia. Pak J Med Sci. 2018 Nov-Dec;34(6):1571-1575.

In both inherited and acquired deficiency states, vitamin E deficiency can contribute to cerebellar dysfunction and central cognitive effects because α‑tocopherol protects vulnerable neurons, including cerebellar Purkinje cells, from ongoing oxidative damage across the lifespan. In AVED, where an α‑TTP defect prevents normal vitamin E transport, deficiency is associated with spinocerebellar ataxia, Purkinje cell loss, degeneration of sensory neurons, and a characteristic “dying back” neuropathy, yet long‑term α‑tocopherol supplementation over many years can slow or even prevent further neurologic progression when started early. Experimental and clinical data also show that even brief interruptions in vitamin E supplementation can measurably lower plasma total radical‑trapping antioxidant capacity before obvious symptom worsening, highlighting renewed oxidative vulnerability of nervous tissue and reinforcing the importance of consistent repletion to support normal neurogenesis and central nervous system function.

Research: Thapa S, Shah S, Chand S, Sah SK, Gyawali P, Paudel S, Khanal P. Ataxia due to vitamin E deficiency: A case report and updated review. Clin Case Rep. 2022 Sep 6;10(9):e6303. Schuelke M, Finckh B, Sistermans EA, Ausems MG, Hübner C, von Moers A. Ataxia with vitamin E deficiency: biochemical effects of malcompliance with vitamin E therapy. Neurology. 2000 Nov 28;55(10):1584-6. N. Stojiljkovic, S. Redko, F. Gupta, S. Kathiresu Nageshwaran, W. Tse. Cerebellar ataxia due to vitamin E deficiency [abstract]. Mov Disord. 2023; 38 (suppl 1). Traber MG. Vitamin E: necessary nutrient for neural development and cognitive function. Proc Nutr Soc. 2021 Aug;80(3):319-326.

Impacted through 3 nutrients: Vitamin B6, Folic Acid, Vitamin B12.

Zinc deficiency often first shows up on the skin, with acrodermatitis‑like eruptions around the mouth, perineum, and distal extremities, accompanied by alopecia and sometimes nail changes. Characteristic lesions can be erythematous, scaly, or pustular, and both congenital and acquired zinc deficiency states have been reported to improve dramatically within days to weeks of adequate zinc repletion. Clinically, zinc is also crucial for normal collagen synthesis and immune function in the skin, so deficiency is linked to delayed wound healing and weaker scars, whereas restoring zinc status can enhance re‑epithelialization and reduce wound complications.

Research: Kelly S, Stelzer JW, Esplin N, Farooq A, Karasik O. Acquired Acrodermatitis Enteropathica: A Case Study. Cureus. 2017 Sep 8;9(9):e1667. Alwadany MM, Al Wadani AF, Almarri FH, Alyami HS, Al-Subaie MA. Acrodermatitis Enteropathica: A Rare Case With Lifelong Implications. Cureus. 2023 Apr 18;15(4):e37783. Al-Khafaji Z, Brito S, Bin BH. Zinc and Zinc Transporters in Dermatology. Int J Mol Sci. 2022 Dec 18;23(24):16165. Ogawa Y, Kinoshita M, Shimada S, Kawamura T. Zinc and Skin Disorders. Nutrients. 2018 Feb 11;10(2):199.

Low or depleted vitamin B12 status appears more common in people with obesity, contributing to weight gain through impaired metabolic reactions and reduced insulin sensitivity. Obesity itself exerts about a 1.6-fold decreasing effect on vitamin B12 levels, underscoring the importance of monitoring BMI and B12 across the lifespan for multisystem health, including neuronal migration. Large population data further confirm that higher serum B12 levels are inversely associated with obesity, highlighting the need to optimize B12 to mitigate these interconnected risks.

Research: Sun Y, Sun M, Liu B, Du Y, Rong S, Xu G, Snetselaar LG, Bao W. Inverse Association Between Serum Vitamin B12 Concentration and Obesity Among Adults in the United States. Front Endocrinol (Lausanne). 2019 Jun 27;10:414. Boachie J, Adaikalakoteswari A, Samavat J, Saravanan P. Low Vitamin B12 and Lipid Metabolism: Evidence from Pre-Clinical and Clinical Studies. Nutrients. 2020 Jun 29;12(7):1925. Demirtas MS, Kilicaslan C, Erdal H. Evaluation of vitamin B12 levels among severe obese and obese adolescents. J Investig Med. 2024 Apr;72(4):319-325. Samavat, Jinous (2019) The role of vitamin B12 deficiency on obesity, adipocytes and inflammation. PhD thesis, University of Warwick. Neal ES, Kumar V, Borges K, Cuffe JSM. Vitamin B12 deficiency induces glucose intolerance, delays peak insulin levels and promotes ketogenesis in female rats. J Endocrinol. 2023 Jan 19;256(2):e220158.

Low or deficient vitamin C status can matter more than people realize because it can show up as everyday problems they already have, like bleeding gums when they brush or cuts and scrapes that seem slow to heal. Low vitamin C weakens collagen formation, making blood vessels in the gums and skin more fragile and increasing the risk of bleeding gums, easy bruising, and rough, dry skin. Clinical periodontal studies also show that ascorbic acid used alongside standard care can improve bleeding on probing, plaque and gingival indices, clinical attachment level, pocket depth, and gum aesthetics, supporting its role in healthier gums and more efficient healing of both oral tissues and skin.

Research: Murererehe J, Uwitonze AM, Nikuze P, Patel J and Razzaque MS (2022) Beneficial Effects of Vitamin C in Maintaining Optimal Oral Health. Front. Nutr. 8:805809. Ruzijevaite G, Acaite E, Jagelaviciene E. Therapeutic Impact of Ascorbic Acid on Oral and Periodontal Tissues: A Systematic Literature Review. Medicina (Kaunas). 2024 Dec 11;60(12):2041. Al-Niaimi F, Chiang NYZ. Topical Vitamin C and the Skin: Mechanisms of Action and Clinical Applications. J Clin Aesthet Dermatol. 2017 Jul;10(7):14-17. Epub 2017 Jul 1. Fitzpatrick, R.E. and Rostan, E.F. (2002), Double-Blind, Half-Face Study Comparing Topical Vitamin C and Vehicle for Rejuvenation of Photodamage. Dermatologic Surgery, 28: 231-236. Lassig AAD, Wilson AC, Jungbauer WN, Joseph AM, Lindgren B, Odland R. The Effects of Supplemental Vitamin C in Mandibular Fracture Patients: A Randomized Clinical Trial. Recent Progress in Nutrition 2023. Tajari F, Toloue Ghamari B, Jafari Kafiabadi M, Shariatzade H, Biglari F, Mahmoudi Nasab O, Salavati Mohammadi N, Najd Mazhar F. Effect of Vitamin C Injection on Flexor Tendon Healing in Zone II: A Randomized Controlled Trial. Cureus. 2026 Jan 22;18(1):e102075.

When vitamin C intake is too low for too long, it can start to show up in the muscles and joints as deep, aching pain and stiffness rather than just “simple” fatigue. Vitamin C is essential for building and maintaining healthy collagen in cartilage, tendons, and bone, so deficiency can cause bone tenderness, joint pain, and, in children, impaired growth and skeletal deformities similar to rickets or scurvy. In more advanced cases, people may notice difficulty walking, painful swelling around joints, and slower recovery from everyday strains or minor injuries because the connective tissues simply cannot repair and mineralize properly without adequate vitamin C.

Research: Mangano KM, Noel SE, Dawson-Hughes B, Tucker KL. Sufficient Plasma Vitamin C Is Related to Greater Bone Mineral Density among Postmenopausal Women from the Boston Puerto Rican Health Study. J Nutr. 2021 Dec 3;151(12):3764-3772. Kim YA, Kim KM, Lim S, Choi SH, Moon JH, Kim JH, Kim SW, Jang HC, Shin CS. Favorable effect of dietary vitamin C on bone mineral density in postmenopausal women (KNHANES IV, 2009): discrepancies regarding skeletal sites, age, and vitamin D status. Osteoporos Int. 2015 Sep;26(9):2329-37. Ratajczak AE, Szymczak-Tomczak A, Skrzypczak-Zielińska M, Rychter AM, Zawada A, Dobrowolska A, Krela-Kaźmierczak I. Vitamin C Deficiency and the Risk of Osteoporosis in Patients with an Inflammatory Bowel Disease. Nutrients. 2020 Jul 29;12(8):2263. Souza M, Moraes SAS, de Paula DR, Maciel AA, Batista EJO, Silva DGF, Bahia CP, Oliveira KRHM, Herculano AM. Local treatment with ascorbic acid accelerates recovery of post-sutured Achilles tendon in male Wistar rats. Braz J Med Biol Res. 2019;52(9):e8290.

In very sick adults, low thiamine (vitamin B1) can quietly help drive lactic acidosis because the body cannot properly use sugar for energy without it. When thiamine is missing, pyruvate “backs up” and is turned into lactate instead of entering the energy‑producing cycle in the mitochondria, so people with sepsis, heart failure, or shock can develop higher or more persistent lactate levels than their blood flow problems alone would explain. The practical point is that, when lactate stays stubbornly high for no clear reason, giving thiamine is a simple, low‑risk step that can sometimes lead to a surprisingly fast drop in lactate and a visible clinical improvement.

Research: Amrein K, Ribitsch W, Otto R, Worm HC, Stauber RE. Severe lactic acidosis reversed by thiamine within 24 hours. Crit Care. 2011;15(6):457. Hong J, Cho D, Kim HJ, Jo J, Seong GM. Reversible Severe Acute Lactic Acidosis Caused by Thiamine Deficiency in Intensive Care Unit. Case Rep Crit Care. 2025 May 8;2025:3211626. Lerner RK, Pessach I, Rubinstein M, Paret G. Lactic Acidosis as Presenting Symptom of Thiamine Deficiency in Children with Hematologic Malignancy. J Pediatr Intensive Care. 2017 Jun;6(2):132-135. Donnino MW, Carney E, Cocchi MN, Barbash I, Chase M, Joyce N, Chou PP, Ngo L. Thiamine deficiency in critically ill patients with sepsis. J Crit Care. 2010 Dec;25(4):576-81.

On the skin and mucous membranes, vitamin B6 deficiency can cause a seborrheic dermatitis‑like rash with redness, scaling, and itching on the face, scalp, neck, or upper chest, along with fissuring at the lips. Clinical descriptions note that B6‑related mucosal changes can include cheilitis, stomatitis, and glossitis, and some field studies in children have linked low pyridoxine status with a higher prevalence of angular stomatitis and tongue inflammation that improve with B‑complex supplementation. The practical implication is that, when patients present with persistent seborrheic dermatitis‑like eruptions plus mouth sores or tongue soreness, particularly in the setting of poor diet, alcoholism, or malabsorption, assessing vitamin B6 (and other B‑vitamin) status can be an important step toward resolving these dermatologic and mucosal lesions.

Research: Fabrizio Galimberti, et al. Skin findings associated with nutritional deficiencies. Cleveland Clinic Journal of Medicine Volume 83. Number 10 October 2016. Kseniya Perminova. Lesions of the mucous membrane due to hypovitaminosis. 30 January 2024. Mary J. Brown; Sharon F. Daley; Kevin Beier. Vitamin B6 Deficiency. StatPearls. August 8, 2023. Sousou JM, Griffith EM, Marsalisi C, Reddy P. Pyridoxine Deficiency and Neurologic Dysfunction: An Unlikely Association. Cureus. 2023 Oct 25;15(10):e47647.

In many patients, inadequate zinc status affects the gastrointestinal tract, contributing to chronic or recurrent diarrhea, anorexia, and characteristic changes in taste (hypogeusia) and smell (hyposmia) that further suppress intake. Clinical studies in children with acute and persistent diarrhea have shown that zinc supplementation shortens illness duration and reduces subsequent diarrheal episodes, underscoring how low zinc status both results from and perpetuates gut losses. The practical implication is that, when patients present with otherwise unexplained diarrhea, poor appetite, and altered taste or smell, especially in the setting of malabsorption, restrictive diets, or chronic illness, evaluating and correcting zinc deficiency can be an important step in breaking this cycle and restoring nutritional and gastrointestinal health.

Research: Mozaffar B, Ardavani A, Muzafar H, Idris I. The Effectiveness of Zinc Supplementation in Taste Disorder Treatment: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Nutr Metab. 2023 Mar 8;2023:6711071. Heckmann SM, Hujoel P, Habiger S, Friess W, Wichmann M, Heckmann JG, Hummel T. Zinc gluconate in the treatment of dysgeusia--a randomized clinical trial. J Dent Res. 2005 Jan;84(1):35-8. Mahajan SK, Prasad AS, Lambujon J, Abbasi AA, Briggs WA, McDonald FD. Improvement of uremic hypogeusia by zinc: a double-blind study. Am J Clin Nutr. 1980 Jul;33(7):1517-21. Aliani M, Udenigwe CC, Girgih AT, Pownall TL, Bugera JL, Eskin MN. Zinc deficiency and taste perception in the elderly. Crit Rev Food Sci Nutr. 2013;53(3):245-50. Tanaka H, Mori E, Yonezawa N, Sekine R, Nagai M, Tei M, Otori N. Efficacy of Normalising Serum Zinc Level for Patients with Olfactory Dysfunction and Zinc Deficiency. ORL J Otorhinolaryngol Relat Spec. 2024;86(2):73-81.

Low or depleted vitamin B12 status can worsen gastrointestinal problems by impairing mucosal repair and driving malabsorption in conditions such as Crohn’s disease, celiac disease, and small intestinal bacterial overgrowth, where inflammation, resections, and dysbiosis limit B12 uptake. Reduced B12 also weakens white blood cell production and immune defenses, increasing susceptibility to bacterial, viral, and fungal infections that further destabilize gut balance and make it even harder to restore adequate B12 levels.

Research: Akbulut S. An assessment of serum vitamin B12 and folate in patients with Crohn's disease. Medicine (Baltimore). 2022 Dec 16;101(50):e31892. Trimarchi H, Forrester M, Schropp J, Pereyra H, Freixas EA. Low initial vitamin B12 levels in Helicobacter pylori--positive patients on chronic hemodialysis. Nephron Clin Pract. 2004;96(1):c28-32. www.jcimcr.org Page 2 Citation: Andrès E, Lorenzo-Villalba N. Maldigestion and malabsorption of cobalamins (Vitamin B12): Mechanisms, clinical spectrum, at-risk populations, and therapeutic approaches. J Clin Images Med Case Rep. 2025; 6(11): 3841.

Even a modest shortfall in vitamin C can quietly weaken collagen, which makes blood vessels and skin more fragile and sets the stage for easy bruising and rough, bumpy skin. Clinical descriptions of scurvy consistently report extensive bruising and the classic “follicular hyperkeratosis” pattern—dry, rough skin with hard plugs around hair follicles and tiny perifollicular hemorrhages—that clear rapidly once vitamin C is replaced. For someone who bruises at the slightest bump or notices persistent, goose‑bump–like roughness on the thighs or legs, it can be eye‑opening to learn that a simple vitamin C gap in their diet may be contributing—and that correcting it often leads to visible skin changes within weeks.

Research: Pasquali M, Still MJ, Vales T, Rosen RI, Evinger JD, Dembure PP, Longo N, Elsas LJ. Abnormal formation of collagen cross-links in skin fibroblasts cultured from patients with Ehlers-Danlos syndrome type VI. Proc Assoc Am Physicians. 1997 Jan;109(1):33-41. PMID: 9010914. Fitzpatrick RE, Rostan EF. Double-blind, half-face study comparing topical vitamin C and vehicle for rejuvenation of photodamage. Dermatol Surg. 2002 Mar;28(3):231-6. Fraser IM, Dean M. Extensive bruising secondary to vitamin C deficiency. BMJ Case Rep. Humbert P, Fanian F, Lihoreau T, Jeudy A, Pierard GE. Bateman purpura (dermatoporosis): a localized scurvy treated by topical vitamin C - double-blind randomized placebo-controlled clinical trial. J Eur Acad Dermatol Venereol. 2018 Feb;32(2):323-328. 2009;2009:bcr08.2008.0750.

Vitamin C shortfalls can matter more than people realize because they can quietly undermine iron status and contribute to microcytic, iron‑deficiency–type anemia. Vitamin C is one of the few nutrients that significantly boosts non‑heme iron absorption, helping convert dietary iron into a form the gut can take up more easily and counteracting common inhibitors found in grains, legumes, tea, and coffee. In people whose diets are low in both iron and vitamin C, this combination can show up as persistent fatigue, pallor, and microcytic red blood cells on lab work, with studies in iron‑depleted women showing that added ascorbic acid improved iron absorption and anemia markers over just a few weeks.

Research: Alhatem A, Cai D. Behind the Skin: A Rare Case of Scurvy-Associated Megaloblastic Anemia. Clin Med Insights Case Rep. 2019 May 10;12:1179547619849036. Ricaurte FR, Kewan T, Daw H. Scurvy: A Rare Cause of Anemia. Cureus. 2019 Sep 18;11(9):e5694.Golding PH. Experimental folate deficiency in human subjects: what is the influence of vitamin C status on time taken to develop megaloblastic anaemia? BMC Hematol. 2018 Jun 19;18:13. Kim YL. Vitamin C and functional iron deficiency anemia in hemodialysis. Kidney Res Clin Pract. 2012 Mar;31(1):1-3.

In some adults, thiamine (vitamin B1) deficiency shows up first in the gut, with anorexia, nausea, early satiety, abdominal discomfort, constipation, or a sense that “the stomach and intestines just are not moving right.” Case reports and small series in humans describe improvement in nausea, constipation, dysphagia, and intestinal dysmotility after thiamine supplementation, which supports a causal role for deficiency in disordered gastrointestinal motor and secretory function. The practical takeaway is that, when patients have otherwise unexplained appetite loss and upper or lower GI symptoms in the setting of poor intake, alcohol use, or critical illness, it is important to consider and correct possible thiamine deficiency as part of the evaluation.

Research: Prakash S. Gastrointestinal beriberi: a forme fruste of Wernicke's encephalopathy? BMJ Case Rep. 2018 Jul 6;2018:bcr2018224841. Duca J, Lum C. Rare Presentation of Thiamine Deficiency as Gastrointestinal Syndrome. Hawaii J Med Public Health. 2014 Sep;73(9 Suppl 1):46. PMCID: PMC4175961. Overton E, Emelyanova A, Bunik VI. Thiamine, gastrointestinal beriberi and acetylcholine signaling. Front Nutr. 2025 Apr 9;12:1541054. A. Meckley et al. Suspected Thiamine Deficiency Secondary to Chronic. HCA Healthcare Journal of Medicine (2024) 5:2 Gastrointestinal Illness: A Case Report.

In fat‑malabsorption states and cholestatic liver disease, vitamin E deficiency can amplify oxidative injury because α‑tocopherol is normally carried on circulating lipoproteins and helps shield both cell membranes and lipids from ongoing free‑radical damage. In severe genetic fat‑malabsorption such as abetalipoproteinemia, very low plasma vitamin E levels have been linked to progressive ophthalmopathy and neuropathy, and even with aggressive supplementation, HDL particles can remain severely oxidized, signaling persistent lipid peroxidation and oxidative modification of lipoproteins. Together, these observations support the idea that vitamin E deficiency layered on top of structurally abnormal or depleted lipoproteins creates a “perfect storm” for heightened oxidative stress in tissues, underscoring the need for early detection, carefully absorbed α‑tocopherol formulations, and close monitoring of at‑risk patients with chronic cholestasis or malabsorption.

Research: Burnett JR, Hooper AJ. Vitamin E and oxidative stress in abetalipoproteinemia and familial hypobetalipoproteinemia. Free Radic Biol Med. 2015 Nov;88(Pt A):59-62. Siener R, Machaka I, Alteheld B, Bitterlich N, Metzner C. Effect of Fat-Soluble Vitamins A, D, E and K on Vitamin Status and Metabolic Profile in Patients with Fat Malabsorption with and without Urolithiasis. Nutrients. 2020 Oct 12;12(10):3110. Margareth L. G. SaronI, et al. Nutritional status of patients with biliary atresia and autoimmune hepatitis related to serum levels of vitamins A, D and E. Department of Pediatrics. UNICAMP, Campinas, SP, Brazil 2008. Granot E, Kohen R. Oxidative stress in abetalipoproteinemia patients receiving long-term vitamin E and vitamin A supplementation. Am J Clin Nutr. 2004 Feb;79(2):226-30.