Questran Light Side Effects & Health Impacts

Low folate status contributes to elevated homocysteine, a metabolite that has been associated with endothelial dysfunction, arterial stiffness, and a higher risk of stroke and coronary heart disease. Large observational studies consistently show that individuals with higher homocysteine levels have greater rates of cardiovascular events, and folate intake is one of the key nutritional determinants of homocysteine. Clinically, folic acid supplementation (often combined with vitamins B6 and B12) can lower homocysteine and appears to modestly reduce stroke risk in some populations, making the identification and correction of folate deficiency an important part of broader cardiovascular risk reduction.

Research: Yanping Li, et al. Folic Acid Supplementation and the Risk of Cardiovascular Diseases: A Meta‐Analysis of Randomized Controlled Trials. Journal of the American Heart Association. Volume 5, Number 8. August 15 2016.Yi X, Zhou Y, Jiang D, Li X, Guo Y, Jiang X. Efficacy of folic acid supplementation on endothelial function and plasma homocysteine concentration in coronary artery disease: A meta-analysis of randomized controlled trials. Exp Ther Med. 2014 May;7(5):1100-1110. Kaye AD, Jeha GM, Pham AD, Fuller MC, Lerner ZI, Sibley GT, Cornett EM, Urits I, Viswanath O, Kevil CG. Folic Acid Supplementation in Patients with Elevated Homocysteine Levels. Adv Ther. 2020 Oct;37(10):4149-4164. Lonn E, Yusuf S, Arnold MJ, Sheridan P, Pogue J, Micks M, McQueen MJ, Probstfield J, Fodor G, Held C, Genest J Jr; Heart Outcomes Prevention Evaluation (HOPE) 2 Investigators. Homocysteine lowering with folic acid and B vitamins in vascular disease. N Engl J Med. 2006 Apr 13;354(15):1567-77. Wald DS, Bishop L, Wald NJ, et al. Randomized Trial of Folic Acid Supplementation and Serum Homocysteine Levels. Arch Intern Med. 2001;161(5):695–700.

Vitamin A deficiency can damage the surface of the eye in both children and adults, progressing from dry, uncomfortable eyes and night‑vision problems to xerophthalmia and, in severe cases, permanent blindness if it is missed. Regular vitamin A from food and, when appropriate, thoughtfully used supplements can meaningfully reduce this risk; in one large analysis, children in the highest overall intake group had about a 62 percent lower risk of xerophthalmia than those in the lowest group (multivariate relative risk 0.38, 95 percent confidence interval 0.19–0.74). Vitamin A deficiency and xerophthalmia have been documented not just in low‑resource settings but also in at‑risk children and adults in developed countries, so anyone with unexplained dry eyes, night‑vision changes, or corneal findings should have vitamin A status considered and be referred promptly for ophthalmology review to help protect their sight.

Research: Chiu M, Dillon A, Watson S. Vitamin A deficiency and xerophthalmia in children of a developed country. J Paediatr Child Health. 2016 Jul;52(7):699-703. Djunaedi E, Sommer A, Pandji A, Kusdiono, Taylor HR. Impact of Vitamin A Supplementation on Xerophthalmia: A Randomized Controlled Community Trial. Arch Ophthalmol. 1988;106(2):218–222.Chiu M, Watson S. Xerophthalmia and vitamin A deficiency in an autistic child with a restricted diet. BMJ Case Rep. 2015 Oct 5;2015:bcr2015209413. Fawzi WW, Herrera MG, Willett WC, el Amin A, Nestel P, Lipsitz S, Spiegelman D, Mohamed KA. Vitamin A supplementation and dietary vitamin A in relation to the risk of xerophthalmia. Am J Clin Nutr. 1993 Sep;58(3):385-91.

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.

Inadequate vitamin D undermines calcium absorption and bone remodeling, so chronic deficiency increases the risk of low bone mineral density, osteoporosis, and osteomalacia with bone pain and muscle weakness. Epidemiologic data have linked low 25‑hydroxyvitamin D levels with higher rates of fragility fractures, particularly hip and vertebral fractures in older adults, even after adjusting for age and baseline bone density. Clinically, correcting vitamin D deficiency, together with adequate calcium intake, resistance exercise, and fall‑prevention strategies, has been shown to improve bone mineral density and help reduce fracture risk in at‑risk populations.

Research: Bowden SA, Robinson RF, Carr R, Mahan JD. Prevalence of vitamin D deficiency and insufficiency in children with osteopenia or osteoporosis referred to a pediatric metabolic bone clinic. Pediatrics. 2008 Jun;121(6):e1585-90. Lv QB, Gao X, Liu X, Shao ZX, Xu QH, Tang L, Chi YL, Wu AM. The serum 25-hydroxyvitamin D levels and hip fracture risk: a meta-analysis of prospective cohort studies. Oncotarget. 2017 Jun 13;8(24):39849-39858. Brodrick, Siobhan E.M. Vitamin D insufficiency and deficiency: in search of a bone disease. Pathology Volume 58, Issue 2, March 2026, Pages 156-162. Weaver CM, Alexander DD, et al. Calcium plus vitamin D supplementation and risk of fractures: an updated meta-analysis from the National Osteoporosis Foundation. Osteoporos Int. 2016 Jan;27(1):367-76. Silva BC, Camargos BM, Fujii JB, Dias EP, Soares MM. Prevalência de deficiência e insuficiência de vitamina D e sua correlação com PTH, marcadores de remodelação óssea e densidade mineral óssea, em pacientes ambulatoriais [Prevalence of vitamin D deficiency and its correlation with PTH, biochemical bone turnover markers and bone mineral density, among patients from ambulatories]. Arq Bras Endocrinol Metabol. 2008 Apr;52(3):482-8. Portuguese

Vitamin D receptors are present in blood vessels and heart muscle, and deficiency has been linked in observational studies to higher rates of hypertension and heart failure. In large cohorts, people with low 25‑hydroxyvitamin D levels more often have elevated blood pressure and show a greater incidence of new‑onset heart failure and cardiovascular events over time, even after adjusting for some traditional risk factors. Clinically, maintaining adequate vitamin D levels is regarded as a simple, proactive way to support healthier vascular tone, blood pressure regulation, and overall cardiovascular resilience.

Research: Karadeniz Y, Özpamuk-Karadeniz F, Ahbab S, Ataoğlu E, Can G. Vitamin D Deficiency Is a Potential Risk for Blood Pressure Elevation and the Development of Hypertension. Medicina (Kaunas). 2021 Nov 25;57(12):1297. Thomas J. Wang, et al. Vitamin D Deficiency and Risk of Cardiovascular Disease. Circulation. 7 January 2008. Volume 117, Number 4. Ajenaghughrure G, Nwaezeapu K, Ogunniyi K. Impact Of Vitamin D Deficiency On Outcomes In Patients With Diastolic Heart Failure Journal of Cardiac Failure, 32360. Valer-Martinez A, Bes-Rastrollo M, Martinez JA, Martinez-Gonzalez MA, Sayon-Orea C. Vitamin D and the Risk of Developing Hypertension in the SUN Project: A Prospective Cohort Study. Nutrients. 2024 Jul 20;16(14):2351.

Vitamin D deficiency has been consistently associated with higher risk of metabolic problems, including insulin resistance and type 2 diabetes. A meta-analysis of 21 prospective studies following 76,220 participants and documenting 4,996 new type 2 diabetes cases found a clear, statistically significant inverse relationship between circulating 25(OH)D levels and future diabetes risk across diverse populations. In clinical research, people with type 2 diabetes typically show significantly lower vitamin D levels and higher HOMA-IR scores than healthy controls, with an inverse correlation between vitamin D status and insulin resistance that supports a potential mechanistic role of deficiency in the pathophysiology of insulin resistance.

Research: Xu, Z., Gong, R., Luo, G. et al. Association between vitamin D3 levels and insulin resistance: a large sample cross-sectional study. Sci Rep 12, 119 (2022). Jain PK, Nigotia P, Mishra A, Singh LP. Association of vitamin D deficiency with insulin resistance among type 2 diabetes mellitus patients - A case-control study. Bioinformation. 2025 Aug 31;21(8):2897-2900. Ehrampoush E, Mirzay Razzaz J, Arjmand H, Ghaemi A, Raeisi Shahraki H, Ebrahim Babaei A, Osati S, Homayounfar R. The association of vitamin D levels and insulin resistance. Clin Nutr ESPEN. 2021 Apr;42:325-332. Song Y, Wang L, Pittas AG, Del Gobbo LC, Zhang C, Manson JE, Hu FB. Blood 25-hydroxy vitamin D levels and incident type 2 diabetes: a meta-analysis of prospective studies. Diabetes Care. 2013 May;36(5):1422-8.

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.

Low vitamin A status can quietly undermine reproductive health, because vitamin A is deeply involved in egg and sperm development, maintenance of reproductive tissues, and the signaling events that trigger meiosis in both the female and male gonad. Studies in pregnant women in rural South Asia show that bringing vitamin A intake closer to recommended levels markedly reduced, but did not fully eliminate, night blindness during pregnancy and postpartum, suggesting that vitamin A supplementation, alongside other key nutrients, may be required to fully protect maternal vision and status. For individuals with fertility challenges or for pregnant women reporting new night‑vision problems, proactively assessing vitamin A status and considering targeted, evidence‑based supplementation protocols can be an important strategy to improve reproductive outcomes and reduce adverse pregnancy risks

Research: Christian P, West KP Jr, Khatry SK, Katz J, LeClerq S, Pradhan EK, Shrestha SR. Vitamin A or beta-carotene supplementation reduces but does not eliminate maternal night blindness in Nepal. J Nutr. 1998 Sep;128(9):1458-63. Amel Alouache. Vitamin A: Benefits and Consequences of Its Deficiency on Health. May 2025.DOI: 10.5772/intechopen.1010232. Clagett-Dame M, Knutson D. Vitamin A in reproduction and development. Nutrients. 2011 Apr;3(4):385-428. Haskell MJ, Pandey P, Graham JM, Peerson JM, Shrestha RK, Brown KH. Recovery from impaired dark adaptation in nightblind pregnant Nepali women who receive small daily doses of vitamin A as amaranth leaves, carrots, goat liver, vitamin A-fortified rice, or retinyl palmitate. Am J Clin Nutr. 2005 Feb;81(2):461-71.

Vitamin A and beta carotene are essential for maintaining the integrity of the cornea and the light-sensing pigments in the retina, so deficiency greatly increases the risk of night blindness and other ocular pathologies. In vitamin A deficient regions, hundreds of thousands of children each year develop xerophthalmia, ranging from conjunctival and corneal dryness to corneal ulceration and keratomalacia, which can progress to irreversible blindness if not corrected. Even subclinical deficiency can impair dark adaptation and increase susceptibility to eye infections, making adequate vitamin A and carotenoid intake a critical foundation for long-term visual health.

Research: Haskell MJ, Pandey P, Graham JM, Peerson JM, Shrestha RK, Brown KH. Recovery from impaired dark adaptation in nightblind pregnant Nepali women who receive small daily doses of vitamin A as amaranth leaves, carrots, goat liver, vitamin A-fortified rice, or retinyl palmitate. Am J Clin Nutr. 2005 Feb;81(2):461-71. Ten Hulzen RD, Wagner IV, Decastro PY, Sullivan JP. Visual field decline and restoration following vitamin A therapy for vitamin A deficiency. Am J Ophthalmol Case Rep. 2022 Mar 5;26:101471. Smith, Janine M.D.; Steinemann, Thomas L. M.D.. Vitamin A Deficiency and the Eye. International Ophthalmology Clinics 40(4):p 83-91, Fall 2000. Hu Y, Chen Y, Moiseyev G, Takahashi Y, Mott R, Ma JX. Comparison of ocular pathologies in vitamin A-deficient mice and RPE65 gene knockout mice. Invest Ophthalmol Vis Sci. 2011 Jul 25;52(8):5507-14.

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.

Vitamin D deficiency has been associated with a higher risk and greater disease activity in several autoimmune conditions, including rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), and multiple sclerosis (MS). Observational studies consistently report that patients with these autoimmune diseases are more likely to have low 25‑hydroxyvitamin D levels than healthy controls, and that lower levels often correlate with more frequent flares or higher inflammatory markers. Early interventional research also suggests that improving vitamin D status may help modulate immune function and reduce inflammatory activity, supporting its role as a positive adjunct in autoimmune health.

Research: Rexhepi M, Krasniqi B, Hoti K, Daci A, Rexhepi-Kelmendi B, Krasniqi S. Impact of vitamin D supplementation on disease activity and pain management in rheumatoid arthritis: a randomized double-blinded controlled study. BMC Rheumatol. 2025 Jul 11;9(1):87. Abou-Raya A, Abou-Raya S, Helmii M. The effect of vitamin D supplementation on inflammatory and hemostatic markers and disease activity in patients with systemic lupus erythematosus: a randomized placebo-controlled trial. J Rheumatol. 2013 Mar;40(3):265-72. Lima GL, Paupitz J, Aikawa NE, Takayama L, Bonfa E, Pereira RM. Vitamin D Supplementation in Adolescents and Young Adults With Juvenile Systemic Lupus Erythematosus for Improvement in Disease Activity and Fatigue Scores: A Randomized, Double-Blind, Placebo-Controlled Trial. Arthritis Care Res (Hoboken). 2016 Jan;68(1):91-8. Hupperts R, Smolders J, Vieth R, Holmøy T, Marhardt K, Schluep M, Killestein J, Barkhof F, Beelke M, Grimaldi LME; SOLAR Study Group. Randomized trial of daily high-dose vitamin D3 in patients with RRMS receiving subcutaneous interferon β-1a. Neurology. 2019 Nov 12;93(20):e1906-e1916.

In some adults, chronic folate deficiency has been linked to neurological manifestations such as peripheral neuropathy, gait disturbance, and subtle to more overt cognitive impairment, especially in older age. Cohort studies have reported that low serum or red cell folate, and elevated homocysteine, correlate with worse performance on memory and executive‑function tests, and may be associated with increased risk of vascular dementia. The encouraging aspect is that, when folate deficiency is identified early and corrected alongside vitamin B12 when needed, some patients experience improvement in neuropathic symptoms and stabilization or modest gains in cognitive performance, particularly when other vascular risk factors are also addressed.

Research: Boumenna T, Scott TM, Lee JS, Palacios N, Tucker KL. Folate, vitamin B-12, and cognitive function in the Boston Puerto Rican Health Study. Am J Clin Nutr. 2021 Jan 4;113(1):179-186. Alves Maues AC, Moren Abat MG, Benlloch M, Mariscal G. Folate Supplementation for Peripheral Neuropathy: A Systematic Review. Nutrients. 2025 Oct 20;17(20):3299. Mottaghi T, Khorvash F, Maracy M, Bellissimo N, Askari G. Effect of folic acid supplementation on nerve conduction velocity in diabetic polyneuropathy patients. Neurol Res. 2019 Apr;41(4):364-368. Manzoor M, Runcie J. Folate-responsive neuropathy: report of 10 cases. Br Med J. 1976 May 15;1(6019):1176-8. Kang WB, Chen YJ, Lu DY, Yan JZ. Folic acid contributes to peripheral nerve injury repair by promoting Schwann cell proliferation, migration, and secretion of nerve growth factor. Neural Regen Res. 2019 Jan;14(1):132-139.

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

Impacted through 2 nutrients: Vitamin D3, Vitamin E.

Impacted through 2 nutrients: Vitamin D3, Folic Acid.

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.

Vitamin A deficiency does not just affect vision; it also weakens the body’s front‑line defenses against infection, so common illnesses can become more severe, harder to recover from, and, in some cases, life‑threatening. In resource‑poor settings where diets are marginal and repeated gut infections are common, low vitamin A stores and ongoing inflammation often travel together, and infections like measles can drive serum vitamin A down by more than 30 percent at the very moment the immune system needs it most. For a child or adult facing frequent or unusually severe infections, especially in the context of poor diet or chronic gastrointestinal problems, it can be eye‑opening to realize that a hidden vitamin A gap may be quietly amplifying the risk of complications and mortality in otherwise “routine” illnesses.

Research: Coutsoudis A, Broughton M, Coovadia HM. Vitamin A supplementation reduces measles morbidity in young African children: a randomized, placebo-controlled, double-blind trial. Am J Clin Nutr. 1991 Nov;54(5):890-5. Imdad A, Mayo-Wilson E, Haykal MR, Regan A, Sidhu J, Smith A, Bhutta ZA. Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age. Cochrane Database Syst Rev. 2022 Mar 16;3(3):CD008524. Christopher Hodge; Christopher Taylor. Vitamin A Deficiency. StatPearls. January 2, 2023. Vitamin A supplementation in northern Ghana: effects on clinic attendances, hospital admissions, and child mortality. Ghana VAST Study Team. Lancet. 1993 Jul 3;342(8862):7-12. Erratum in: Lancet 1993 Jul 24;342(8865):250. PMID: 8100345.

Vitamin A and its precursor beta carotene play a key role in cell differentiation and tissue growth, so deficiency is strongly linked to impaired linear growth and developmental delays in children. In some low‑income regions, vitamin A deficiency affects up to a third of preschool‑aged children, and supplementation programs in deficient populations have been associated with measurable improvements in growth as well as reductions in child morbidity and mortality. Even in milder deficiency states, inadequate vitamin A status can subtly slow growth velocity, weaken epithelial barriers, and compromise immune development, making sufficient intake during pregnancy and childhood especially important for healthy growth and maturation.

Research: West KP, LeClerq SC, Shrestha SR, Wu LS, Pradhan EK, Khatry SK, Katz J, Adhikari R, Sommer A. Effects of vitamin A on growth of vitamin A-deficient children: field studies in Nepal. J Nutr. 1997 Oct;127(10):1957-65. Hu Q, Lyu J, Li J, Lin X, Li S, Bu Y and Zhao Q (2025) A comprehensive analysis of vitamin a deficiency burden and trends: insights from the global burden of disease study 2021 and future predictions to 2050. Front. Nutr. 12:1673576. Ssentongo P, Ba DM, Ssentongo AE, Fronterre C, Whalen A, Yang Y, Ericson JE, Chinchilli VM. Association of vitamin A deficiency with early childhood stunting in Uganda: A population-based cross-sectional study. PLoS One. 2020 May 29;15(5):e0233615.

Vitamin D plays a key role in muscle function, so deficiency can present with proximal muscle weakness, diffuse aches, and an increased risk of falls and difficulty rising from a chair or climbing stairs. Clinical reports describe patients with severe vitamin D deficiency and myopathy who regained normal muscle strength and mobility within about 4–6 weeks of treatment; in one series, four patients became fully mobile with normalized 25‑hydroxyvitamin D levels, and a fifth also became mobile even though parathyroid hormone levels, while lower, remained somewhat elevated. The practical takeaway is that, in people with otherwise unexplained muscle weakness, falls, and chronic musculoskeletal pain, checking and correcting vitamin D deficiency can lead to rapid, meaningful improvements in function and quality of life.

Research: Prabhala A, Garg R, Dandona P. Severe myopathy associated with vitamin D deficiency in western New York. Arch Intern Med. 2000 Apr 24;160(8):1199-203. Appel LJ, Michos ED, Mitchell CM, Blackford AL, Sternberg AL, Miller ER 3rd, Juraschek SP, Schrack JA, Szanton SL, Charleston J, Minotti M, Baksh SN, Christenson RH, Coresh J, Drye LT, Guralnik JM, Kalyani RR, Plante TB, Shade DM, Roth DL, Tonascia J; STURDY Collaborative Research Group. The Effects of Four Doses of Vitamin D Supplements on Falls in Older Adults : A Response-Adaptive, Randomized Clinical Trial. Ann Intern Med. 2021 Feb;174(2):145-156. Borim FSA, Alexandre TDS, Neri AL, Máximo RO, Silva MF, de Oliveira C. Combined Effect of Dynapenia (Muscle Weakness) and Low Vitamin D Status on Incident Disability. J Am Med Dir Assoc. 2019 Jan;20(1):47-52. Lois Baker. UB Endocrinologist Reports First U.S. Cases Of Severe Muscle Weakness Due To Vitamin D Deficiency. University of Buffalo. April 2000.

Impacted through 2 nutrients: Vitamin A, Folic Acid.

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.

Vitamin A plays a central role in keeping skin and mucosal surfaces healthy by binding nuclear receptors that regulate epithelial cell turnover, barrier integrity, and local immune responses, including how cytokines are produced and how immune cells move to and protect mucosal tissues. When vitamin A is deficient, those finely tuned controls become unbalanced, leading to rough, dry, or hyperkeratotic skin, more fragile linings in the gut, lungs, and eyes, and a shift toward inflammatory signaling that can leave barriers both irritated and easier for pathogens to breach. For someone dealing with persistently dry, rough skin, frequent chapped lips or mouth sores, or ongoing gut irritation it can be important to consider whether an underlying vitamin A deficiency is quietly undermining the very barriers that are supposed to protect them.

Research: Surman SL, Penkert RR, Sealy RE, Jones BG, Marion TN, Vogel P, Hurwitz JL. Consequences of Vitamin A Deficiency: Immunoglobulin Dysregulation, Squamous Cell Metaplasia, Infectious Disease, and Death. Int J Mol Sci. 2020 Aug 4;21(15):5570. Amel Alouache. Vitamin A: Benefits and Consequences of Its Deficiency on Health. May 2025.DOI: 10.5772/intechopen.1010232. Amimo JO, Michael H, Chepngeno J, Raev SA, Saif LJ, Vlasova AN. Immune Impairment Associated with Vitamin A Deficiency: Insights from Clinical Studies and Animal Model Research. Nutrients. 2022 Nov 26;14(23):5038.