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

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Synopsis

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

Collagen peptides are often marketed for hair health, primarily based on their role as a source of amino acids necessary for protein synthesis in the body. Collagen is the most abundant protein in the human body, and its peptides are derived from hydrolyzed collagen, which is easier to digest and absorb. Theoretically, providing these amino acids could support keratin production, the main protein in hair. Some small studies and animal research suggest that collagen supplementation might help stimulate hair growth or improve hair strength by providing proline and glycine, which are important for keratin synthesis. However, high-quality human clinical trials specifically investigating the effects of collagen peptides on hair growth, density, or overall hair health are limited. The current body of evidence is largely indirect or anecdotal, with most benefits extrapolated from collagen's effects on skin and connective tissue. A few studies suggest potential benefits, but they often suffer from small sample sizes, lack of controls, or are sponsored by supplement manufacturers. Therefore, while there is a plausible biological mechanism and some preliminary human and animal data, the evidence supporting collagen peptides for hair health is not robust. Most recommendations are based on theoretical benefits rather than strong scientific validation.

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