Evidence supporting the use of: Vitamin (unspecified)
For the body system: Nails

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Vitamins, particularly biotin (vitamin B7), are commonly used to support nail health. Scientific studies have shown that biotin supplementation can improve nail strength and reduce brittleness in individuals with brittle nail syndrome. Several clinical trials and case reports suggest that daily biotin supplementation (usually 2.5 mg) over several months leads to measurable improvements in nail thickness and resilience. However, evidence supporting the use of other vitamins (such as vitamin A, C, D, or E) for nail health is limited and less robust. Deficiencies in certain vitamins can lead to nail abnormalities, indicating that adequate vitamin intake is necessary for normal nail structure and function. However, in people without specific deficiencies, supplementation may provide limited additional benefit. Overall, the scientific support for biotin in nail health is moderate, while evidence for other vitamins is weaker. Routine vitamin supplementation for nails is best considered for those with known deficiencies or clinical signs of brittle nails, rather than for the general population. More large-scale, controlled studies are needed to determine the efficacy of vitamins beyond biotin in improving nail health.

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