Evidence supporting the use of: Collagen (unknown source)
For the body system: Nails

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Synopsis

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

Collagen, a structural protein found abundantly in connective tissues, has gained popularity as a supplement purported to support nail health. Scientific evidence supporting its use for nails is moderate but emerging. Several small clinical studies have evaluated the effects of collagen peptide supplementation on nail growth and strength. For example, a 2017 open-label pilot study published in Journal of Cosmetic Dermatology found that daily oral supplementation with bioactive collagen peptides for 24 weeks increased nail growth rate by 12% and reduced the frequency of broken nails by 42% in participants with brittle nail syndrome. The study suggested that collagen may improve nail integrity and appearance, though it was limited by its small sample size and lack of a placebo group.

Other research has explored the mechanism, noting that collagen provides amino acids essential for keratin protein synthesis, which is a major component of nails. However, more robust, placebo-controlled trials are needed to definitively establish benefits, optimal dosing, and the relevance of collagen source. In summary, while there is some scientific basis for the use of collagen to support nail health, the evidence is not yet strong or conclusive, but it does suggest a potential benefit, especially for individuals with brittle nails or slow nail growth.

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