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Health risks of vitamin deficiency and supplementation

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2026-11-01 12:52 UTC → 2026-11-05 10:24 UTC · added ~~removed~~

Medical experts continue to warn against the unregulated use of dietary supplements, emphasizing that ‘natural’ products can pose significant health risks. Recent scrutiny has focused on Vitamin D quality and dosage. A study by consumer magazine Öko-Test of 23 preparations found that many supplements contained excessively high daily dosages, with only one of four tested Vitamin D drop products receiving a ‘good’ rating. International guidance on Vitamin D intake varies significantly, with recommendations ranging from 400 IU by the UK’s NHS to 2,000 IU suggested by the Endocrine Society. Newer warnings highlight the danger of ‘dose stacking,’ where individuals take multiple products containing the same ingredient. Fat-soluble vitamins (A, D, E, and K) are particularly hazardous because they accumulate in the body, potentially causing toxicity, kidney stones, or increased hemorrhage risks. ~~Nutritionists note~~ Professor Zekayi Kutlubay of Istanbul University Cerrahpaşa Faculty of Medicine has cautioned that ~~improper use~~ high doses of ~~supplements like creatine, whey protein,~~ Vitamin D, Vitamin C, and ~~multivitamins~~ collagen taken to maintain appearance can lead to ~~gastrointestinal discomfort~~ poisoning, including liver and dangerous interactions with medications. While whey protein is a practical source for athletes or the elderly, it cannot replace complete meals. Experts also advise verifying product authenticity through independent quality certifications to avoid counterfeit goods. A 2024 study in Jama Network Open involving over 390,000 adults suggested kidney failure. He advises that daily multivitamin use was not associated with lower mortality and may even be linked to a 4% higher risk of death compared to non-users. Specific risks include liver inflammation from high doses of green tea extract, Vitamin A, or Niacin. Experts also warn physicians must determine specific needs rather than individuals purchasing supplements based on hearsay. Regarding deficiency, dermatology specialist Dr. Ayda Kart Aşkar warns that ~~certain foods~~ reduced winter sunlight can ~~pose risks if consumed in extreme quantities: soy may contain cadmium, cruciferous vegetables contain goitrogens~~ cause Vitamin D drops that ~~can interfere with thyroid function, tea may contain fluoride,~~ exacerbate dermatological conditions. These include thickening psoriasis plaques, increased eczema attacks, oily dandruff, and ~~almonds contain phytic acid which can hinder mineral absorption. Additionally, brown rice may contain inorganic arsenic.~~ seasonal hair loss. Beyond skin issues, deficiencies are linked to decreased bone density, muscle weakness, and mood fluctuations such as depression or anxiety.

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