Tarpeyo Side Effects & Health Impacts

Across the lifespan, chronically low calcium intake has been linked to higher blood pressure, in part because calcium plays a key role in vascular smooth‑muscle contraction, sodium handling, and endothelial function. Large epidemiologic studies and randomized trials suggest that individuals with higher dietary calcium intake tend to have modestly lower systolic and diastolic blood pressures and may experience a small but meaningful reduction in risk of stroke and other cardiovascular events. The practical takeaway is that maintaining adequate daily calcium, alongside blood pressure control, exercise, and a heart‑healthy diet, may be an underutilized strategy to support vascular health and reduce long‑term cardiovascular risk.

Research: Kim MH, Bu SY, Choi MK. Daily calcium intake and its relation to blood pressure, blood lipids, and oxidative stress biomarkers in hypertensive and normotensive subjects. Nutr Res Pract. 2012 Oct;6(5):421-8. Hamer O, Mohamed A, Ali-Heybe Z, Schnieder E, Hill JE. Calcium supplementation for the prevention of hypertension: a synthesis of existing evidence and implications for practise. Br J Card Nurs. 2024 Feb 24;19(2):0010. Cheng, L., Lian, J., Ding, Y., Wang, X., Munir, M. A. M., Ullah, S., Wang, E., He, Z., & Yang, X. (2024). Calcium deficiency and its implications for cardiovascular disease and cancer: Strategies for resolution via agronomic fortification. Food Science & Nutrition, 12, 8594–8607.

For someone wondering whether low selenium is “just a lab number,” very low selenium status has been linked in epidemiologic research to a higher risk of cancer over time, especially when blood levels fall below roughly 70 µg/L. In one nested case‑control study, women with serum selenium at or below this level had more than double the overall cancer risk compared with those in the 80–90 µg/L range (odds ratio about 2.6, with confidence intervals that did not cross 1), which fits broader data showing higher cancer rates in clearly deficient populations. At the same time, experts still debate the exact causal role and ideal target range, so the practical takeaway is that identifying and correcting frank selenium deficiency—rather than pushing to very high intakes—may be a sensible strategy for people at risk who want to support long‑term cellular and immune health.

Research: Narod SA, Huzarski T, Jakubowska A, Gronwald J, Cybulski C, Oszurek O, Dębniak T, Jaworska-Bieniek K, Lener M, Białkowska K, Sukiennicki G, Muszyńska M, Marciniak W, Sun P, Kotsopoulos J, Lubiński J. Serum selenium level and cancer risk: a nested case-control study. Hered Cancer Clin Pract. 2019 Dec 23;17:33. M, Sukiennicki G, Jaworowska E, Grodzki T, Sulikowski M, Woloszczyk P, Wójcik J, Lubiński J, Cybulski C, Dębniak T, Lener M, Narod SA, Sun P, Lubiński J, Jakubowska A. Selenium and the risk of cancer of the lung and larynx. A case-control study from a region with low selenium. Hered Cancer Clin Pract. 2012 Apr 20;10(Suppl 3):A7. van den Brandt PA, Goldbohm RA, van 't Veer P, Bode P, Dorant E, Hermus RJ, Sturmans F. A prospective cohort study on selenium status and the risk of lung cancer. Cancer Res. 1993 Oct 15;53(20):4860-5. PMID: 8402674. Hughes DJ, Duarte-Salles T, et al.. Prediagnostic selenium status and hepatobiliary cancer risk in the European Prospective Investigation into Cancer and Nutrition cohort. Am J Clin Nutr. 2016 Aug;104(2):406-14.

In adults, chronically low calcium intake can quietly erode skeletal integrity, contributing to osteopenia, osteoporosis, and a higher risk of low‑trauma fractures over time. In children, inadequate calcium (often alongside vitamin D deficiency) impairs normal mineralization of the growing skeleton, leading to rickets with bone pain, deformities, and delayed growth, while in adults the same process manifests as osteomalacia with diffuse bone pain and muscle weakness rather than early fractures. The encouraging reality is that optimizing daily calcium intake, paired with sufficient vitamin D, protein, and weight‑bearing activity, has been shown to improve bone mineral density and meaningfully reduce fracture risk in at‑risk populations.

Research: Bischoff-Ferrari HA, Rees JR, Grau MV, Barry E, Gui J, Baron JA. Effect of calcium supplementation on fracture risk: a double-blind randomized controlled trial. Am J Clin Nutr. 2008 Jun;87(6):1945-51. Cong B, Zhang H. The effects of combined calcium and vitamin D supplementation on bone mineral density and fracture risk in postmenopausal women with osteoporosis: a systematic review and meta-analysis of randomized controlled trials. BMC Musculoskelet Disord. 2025 Oct 8;26(1):928. Heaney RP. Lifelong calcium intake and prevention of bone fragility in the aged. Calcif Tissue Int. 1991;49 Suppl:S42-5. Arnaud, C. D., Sanchez, S. D. The Role of Calcium in Osteoporosis. September 6, 2013. NASA. Lyndon B. Johnson Space Center, Spacelab Life Sciences 1: Reprints of Background Life Sciences Publications. Cairoli E, Aresta C, Giovanelli L, Eller-Vainicher C, Migliaccio S, Giannini S, Giusti A, Marcocci C, Gonnelli S, Isaia GC, Rossini M, Chiodini I, Di Stefano M; Italian Society for Osteoporosis, Mineral Metabolism, Skeletal Diseases (SIOMMMS). Dietary calcium intake in a cohort of individuals evaluated for low bone mineral density: a multicenter Italian study. Aging Clin Exp Res. 2021 Dec;33(12):3223-3235. Uday S, Högler W. Nutritional Rickets and Osteomalacia in the Twenty-first Century: Revised Concepts, Public Health, and Prevention Strategies. Curr Osteoporos Rep. 2017 Aug;15(4):293-302.

In some patients, significant calcium deficiency leading to hypocalcemia can present with acute respiratory manifestations such as laryngospasm and bronchospasm, often in the context of generalized neuromuscular irritability and tetany. Case reports describe episodes of stridor, tightness in the chest, and even acute respiratory distress that improve as ionized calcium levels are corrected. The key clinical implication is that, when otherwise unexplained laryngospasm or bronchospasm occurs alongside perioral numbness, carpopedal spasm, or muscle cramps, prompt evaluation and correction of calcium deficiency can be lifesaving and help prevent recurrent respiratory compromise.

Research: Kennedy J, Pérusse L, Drapeau V, Tremblay A. Cardiorespiratory Fitness in Low Calcium Consumers: Potential Impact of Calcium Intake on Cardiorespiratory Fitness. Nutrients. 2025; 17(19):3138. Kumari A, Nangrani K, Dolkar T, Arora A, Schmidt M. Hypocalcemia Induced Bronchospasm. Cureus. 2022 Jun 26;14(6):e26339. Thongprayoon C, Cheungpasitporn W, Chewcharat A, et al. Serum ionised calcium and the risk of acute respiratory failure in hospitalised patients: a single-centre cohort study in the USA. BMJ Open 2020;10:e034325. Li X, Li Z, Ye J, Ye W. Association of dietary calcium intake with chronic bronchitis and emphysema. J Health Popul Nutr. 2025 Apr 2;44(1):102.

Selenium deficiency is a well‑established cause of dilated cardiomyopathy and heart failure in low‑selenium regions, classically described as Keshan disease. In these endemic low‑selenium areas, large supplementation trials with sodium selenite significantly reduced the incidence of Keshan disease, providing strong evidence that inadequate selenium intake is a major causal factor rather than a mere association. Modern case reports in patients on long‑term parenteral nutrition, after bariatric surgery, or on highly restrictive elemental diets describe severe, sometimes rapidly progressive heart failure that improves with selenium repletion, underscoring that selenium‑deficiency cardiomyopathy remains a relevant, treatable diagnosis in contemporary clinical practice.

Research: Yusuf SW, Rehman Q, Casscells W. Cardiomyopathy in association with selenium deficiency: a case report. JPEN J Parenter Enteral Nutr. 2002 Jan-Feb;26(1):63-6. Chen X, Yang G, Chen J, Chen X, Wen Z, Ge K. Studies on the relations of selenium and Keshan disease. Biol Trace Elem Res. 1980 Jun;2(2):91-107. Munguti CM, Al Rifai M, Shaheen W. A Rare Cause of Cardiomyopathy: A Case of Selenium Deficiency Causing Severe Cardiomyopathy thFujita Y, Chida-Nagai A, Shibukawa N, Tatsunori I, Suzuki Y, Sasaki D, Yamazawa H, Takeda A. Secondary Cardiomyopathy Due to Selenium Deficiency: Multidimensional Cardiac Evaluation and Treatment. JACC Case Rep. 2025 Aug 20;30(24):104665.at Improved on Supplementation. Cureus. 2017 Aug 29;9(8):e1627.

For an older adult who is feeling “foggy,” forgetful, or mentally slower than they used to be, low selenium status has been linked in several studies to poorer cognitive performance and faster decline compared with peers who have adequate levels. A 2024 trial found that increasing selenium intake improved cognitive test scores only in older adults who already had low baseline cognition, but not in those whose cognition started out normal, suggesting that correcting true deficiency may specifically help a vulnerable subgroup rather than acting as a universal brain booster. Practically, this means that in older people with both low selenium and noticeable cognitive change, assessing status and considering careful selenium repletion may be a reasonable, targeted strategy to support brain function alongside other dementia‑prevention and brain‑health approaches.

Research: Akbaraly TN, Hininger-Favier I, Carrière I, Arnaud J, Gourlet V, Roussel AM, Berr C. Plasma selenium over time and cognitive decline in the elderly. Epidemiology. 2007 Jan;18(1):52-8. doi: 10.1097/01.ede.0000248202.83695.4e. Erratum in: Epidemiology. 2008 Jan;19(1):168. Akbaraly, N Tasnime [corrected to Akbaraly, Tasnime N]. PMID: 17130689. Rita Cardoso B, Silva Bandeira V, Jacob-Filho W, Franciscato Cozzolino SM. Selenium status in elderly: relation to cognitive decline. J Trace Elem Med Biol. 2014 Oct;28(4):422-6. Ferdous KA, Knol LL, Park HA. Association between selenium intake and cognitive function among older adults in the US: National Health and Nutrition Examination Surveys 2011-2014. J Nutr Sci. 2023 May 10;12:e57. Bai, Y. Z., & Zhang, S. Q. (2024). Selenium intake is an effective strategy for the improvement of cognitive decline in low cognition older Americans. International Journal of Food Sciences and Nutrition, 75(7), 687–694.

For someone living with fatigue, hair loss, weight changes, or that “wired‑but‑tired” feeling of thyroid trouble, low selenium status can quietly worsen thyroid function because selenium‑dependent enzymes help both activate thyroid hormone and protect thyroid tissue from the oxidative stress of making it. Clinical trials in autoimmune thyroiditis using about 200 µg per day of selenium have shown meaningful reductions in thyroid peroxidase (TPO) antibody levels and, in some studies, better thyroid ultrasound findings and improved day‑to‑day well‑being, even if the impact on long‑term medication requirements is less consistent. Taken together, this suggests that true selenium deficiency can both aggravate hypothyroid symptoms and dial up autoimmune activity in the thyroid, making selenium testing and thoughtfully dosed supplementation a smart conversation point for people with Hashimoto’s or other chronic thyroid disorders who do not feel fully optimized.

Research: Kobayashi R, Hasegawa M, Kawaguchi C, Ishikawa N, Tomiwa K, Shima M, Nogami K. Thyroid function in patients with selenium deficiency exhibits high free T4 to T3 ratio. Clin Pediatr Endocrinol. 2021;30(1):19-26. Roland Gärtner, Barbara C. H. Gasnier, Johannes W. Dietrich, Bjarne Krebs, Matthias W. A. Angstwurm, Selenium Supplementation in Patients with Autoimmune Thyroiditis Decreases Thyroid Peroxidase Antibodies Concentrations, The Journal of Clinical Endocrinology & Metabolism, Volume 87, Issue 4, 1 April 2002, Pages 1687–1691. Roland Gärtner, Barbara C. H. Gasnier, Johannes W. Dietrich, Bjarne Krebs, Matthias W. A. Angstwurm, Selenium Supplementation in Patients with Autoimmune Thyroiditis Decreases Thyroid Peroxidase Antibodies Concentrations, The Journal of Clinical Endocrinology & Metabolism, Volume 87, Issue 4, 1 April 2002, Pages 1687–1691. Huwiler VV, Maissen-Abgottspon S, Stanga Z, Mühlebach S, Trepp R, Bally L, Bano A. Selenium Supplementation in Patients with Hashimoto Thyroiditis: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Thyroid. 2024 Mar;34(3):295-313.

When someone keeps catching every cold or feels like they never fully bounce back from infections, low selenium status can be an under‑recognized reason, because selenium‑dependent enzymes help immune cells develop properly and stay balanced instead of burning out. Experimental work shows that selenium deficiency interferes with how T cells and other immune cells mature and coordinate, while human data link low selenium levels with more severe viral illnesses and worse outcomes in sepsis and critical care settings. The encouraging part is that, in people who truly are selenium deficient, targeted selenium repletion can help restore more normal immune responses, making it a small but powerful lever for anyone with frequent infections, chronic illness, or high inflammatory burden.

Research: Arvilommi H, Poikonen K, Jokinen I, Muukkonen O, Räsänen L, Foreman J, Huttunen JK. Selenium and immune functions in humans. Infect Immun. 1983 Jul;41(1):185-9. Broome, C. S., McArdle, F., Kyle, J., Andrews, F., Lowe, N. M., Hart, C. A., Arthur, J., & Jackson, M. J. (2004). An increase in selenium intake improves immune function and poliovirus handling in adults with marginal selenium status. The American Journal of Clinical Nutrition, 80(1), 154-162. Kupka R, Mugusi F, Aboud S, Msamanga GI, Finkelstein JL, Spiegelman D, Fawzi WW. Randomized, double-blind, placebo-controlled trial of selenium supplements among HIV-infected pregnant women in Tanzania: effects on maternal and child outcomes. Am J Clin Nutr. 2008 Jun;87(6):1802-8. Fairweather-Tait SJ, Filippini T, Vinceti M. Selenium status and immunity. Proceedings of the Nutrition Society. 2023;82(1):32-38.

In some patients, significant calcium deficiency can culminate in hypocalcemia that presents with neuromuscular irritability, including perioral numbness, carpopedal spasm, frank tetany, and potentially generalized seizures or life‑threatening arrhythmias. Clinical data in children with hypocalcemic seizures suggest that, once acute stabilization is achieved, carefully dosed oral calcium can be as effective as continued intravenous calcium in maintaining serum calcium over the first 24–48 hours, with similar calcium levels and seizure‑recurrence rates reported between groups. The key clinical implication is that prompt recognition and correction of hypocalcemia, followed by an appropriate transition to ongoing oral calcium (and vitamin D when indicated), can help prevent recurrent tetany, seizures, and cardiac instability while longer‑term etiologies of calcium deficiency are addressed.

Research: Han, P., Trinidad, B. J., & Shi, J. (2015). Hypocalcemia-Induced Seizure: Demystifying the Calcium Paradox. ASN Neuro, 7(2). Uday S, Högler W. Nutritional rickets & osteomalacia: A practical approach to management. Indian J Med Res. 2020 Oct;152(4):356-367. Ashwin Reddy S. Ventricular Arrhythmia Precipitated by Severe Hypocalcaemia Secondary to Primary Hypoparathyroidism. Case Rep Cardiol. 2019 Apr 7;2019:4851073. Dhir H, Kumar D, Shah D, Batra P, Ahmed RS, Gupta P. Efficacy of Oral vs. Intravenous Calcium Supplementation for Continuation Therapy in Hypocalcemic Seizures: A Randomized, Controlled Trial. Indian J Pediatr. 2023 May;90(5):433-437.

In both children and adults, chronically low calcium intake can undermine the mineralization of teeth and supporting bone, contributing to enamel hypoplasia, root resorption, and loss of alveolar bone that stabilizes the teeth. Epidemiologic studies have linked lower dietary calcium and dairy intake with higher rates of periodontitis, tooth mobility, and tooth loss, especially in older adults and postmenopausal women. The encouraging piece is that maintaining adequate calcium (alongside vitamin D and good oral hygiene) appears to support healthier periodontal bone and may reduce the risk of dental defects and tooth loss over time.

Research: Nishida M, Grossi SG, Dunford RG, Ho AW, Trevisan M, Genco RJ. Calcium and the risk for periodontal disease. J Periodontol. 2000 Jul;71(7):1057-66. Nascimento GG, Leite FRM, Gonzalez-Chica DA, Peres KG, Peres MA. Dietary vitamin D and calcium and periodontitis: A population-based study. Front Nutr. 2022 Dec 22;9:1016763. Miley DD, Garcia MN, Hildebolt CF, Shannon WD, Couture RA, Anderson Spearie CL, Dixon DA, Langenwalter EM, Mueller C, Civitelli R. Cross-sectional study of vitamin D and calcium supplementation effects on chronic periodontitis. J Periodontol. 2009 Sep;80(9):1433-9. Nishida, M., Grossi, S.G., Dunford, R.G., Ho, A.W., Trevisan, M. and Genco, R.J. (2000), Calcium and the Risk For Periodontal Disease. Journal of Periodontology, 71: 1057-1066.

Impacted through 2 nutrients: Calcium, Selenium.

Selenium deficiency in critical illness has been associated with higher rates of organ failure and mortality, in part because low selenium leaves ICU patients more vulnerable to oxidative damage and immune dysregulation. Observational studies show that many critically ill patients have serum selenium levels below about 70 µg/L, and that these low levels correlate with higher APACHE II and SOFA scores, more frequent septic shock, worse oxygenation, and a greater likelihood of death. Together, these findings suggest that identifying and correcting selenium deficiency in the ICU may be an underused strategy to support antioxidant defenses and potentially improve survival in high‑risk patients.

Research: Tan HH, Liang YC, Shao YC, Chen CM, Chou W. Impact of selenium status and supplementation on outcomes in critically ill patients. Sci Rep. 2025 Oct 10;15(1):35478. Broman M, Lindfors M, Norberg Å, Hebert C, Rooyackers O, Wernerman J, Fläring U. Low serum selenium is associated with the severity of organ failure in critically ill children. Clin Nutr. 2018 Aug;37(4):1399-1405. Costa NA, Gut AL, Pimentel JA, Cozzolino SM, Azevedo PS, Fernandes AA, Polegato BF, Tanni SE, Gaiolla RD, Zornoff LA, Paiva SA, Minicucci MF. Erythrocyte selenium concentration predicts intensive care unit and hospital mortality in patients with septic shock: a prospective observational study. Crit Care. 2014 May 7;18(3):R92. Angstwurm MW, Engelmann L, Zimmermann T, Lehmann C, Spes CH, Abel P, Strauss R, Meier-Hellmann A, Insel R, Radke J, Schüttler J, Gärtner R. Selenium in Intensive Care (SIC): results of a prospective randomized, placebo-controlled, multiple-center study in patients with severe systemic inflammatory response syndrome, sepsis, and septic shock. Crit Care Med. 2007 Jan;35(1):118-26.

Deficiency of calcium over time can sometimes show up in the skin, hair, and nails as dryness, pruritus, brittle or ridged nails, and diffuse hair shedding, especially when hypocalcemia is more chronic. Clinicians often see these dermatologic changes accompanying other signs of calcium and vitamin D deficiency, such as muscle cramps or bone pain, and they may improve as serum calcium and overall mineral status are normalized. The practical point is that, when patients present with unexplained dry skin, fragile nails, and hair loss, particularly in the setting of poor diet, malabsorption, or endocrine disease, assessing and correcting calcium (and related nutrient) deficiencies can be an important part of restoring healthier skin and adnexal structures.

Research: Lee SE, Lee SH. Skin Barrier and Calcium. Ann Dermatol. 2018 Jun;30(3):265-275. Elias P, Ahn S, Brown B, Crumrine D, Feingold KR. Origin of the epidermal calcium gradient: regulation by barrier status and role of active vs passive mechanisms. J Invest Dermatol. 2002 Dec;119(6):1269-74. Baumann J, Wandrey F, Sacher R, Zülli F. A novel Ca2+ double cone vector system to treat compromised skin. Int J Cosmet Sci. 2024 Apr;46(2):228-238. Bouhmadi, A.E., Fatoiki, F.E., Rachadi, H. et al. Hypocalcemia-related pustulosis: a case report. J Med Case Reports 19, 497 (2025).