Evidence supporting the use of: Collagen Peptides
For the body system: Nails

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Collagen peptides are increasingly used as a supplement to support nail health, and there is a growing body of scientific evidence to justify this use, though it remains limited and not yet robust. Collagen is a primary structural protein in the body, and while nails are composed mainly of keratin, some research suggests that collagen supplementation may benefit nail growth and reduce brittleness. A notable study published in 2017 in the Journal of Cosmetic Dermatology (Hexsel et al.) found that daily oral supplementation with bioactive collagen peptides for 24 weeks resulted in a 12% increase in nail growth rate and a 42% decrease in the frequency of broken nails among participants. The proposed mechanism is that collagen peptides may increase the body’s production of keratin and improve microcirculation to the nail bed, thereby enhancing nail strength and growth. However, most available studies are small, industry-sponsored, and lack large, diverse populations. While early findings are promising, more rigorous, independent research is needed to confirm these effects and to better understand the mechanisms involved. In summary, scientific evidence for collagen peptides supporting nail health exists, but it is currently moderate in quality and quantity.

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