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

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Synopsis

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

Collagen is a protein that is an essential component of skin, hair, and connective tissues. Its use as a supplement to support hair health is primarily based on preliminary scientific evidence, though the body of research is still limited and not universally conclusive. Collagen provides amino acids such as proline and glycine, which are vital for the production of keratin—the main structural protein in hair. Some small-scale clinical studies and in vitro research suggest that collagen supplementation may improve hair strength, help reduce hair breakage, and potentially support the health of the scalp by improving skin elasticity and hydration. However, direct evidence that collagen supplementation significantly increases hair growth or prevents hair loss in healthy individuals is scarce. Most available studies are either animal-based, use small sample sizes, or do not isolate collagen as the sole variable. Furthermore, collagen is broken down during digestion, and its specific effect on hair compared to general protein intake is not fully established. While there is a plausible biological rationale and some supporting evidence, large, well-controlled human trials are lacking. Therefore, the scientific support for collagen's role in supporting the hair body system is modest but existent.

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