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

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Synopsis

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

Collagen supplementation is increasingly popular for supporting hair health, with several studies exploring its effects. Collagen is a structural protein that provides strength and elasticity to connective tissues, including skin and hair follicles. Scientific evidence suggests that collagen may indirectly benefit hair by improving skin health, particularly the scalp, which in turn can foster a better environment for hair growth. Some small studies and clinical trials have found that oral collagen peptides can improve skin hydration, elasticity, and dermal collagen density. A healthy scalp is important for robust hair growth, which forms the basis for collagen's use in the “hair” system. Additionally, collagen peptides supply amino acids—especially proline, glycine, and hydroxyproline—which are necessary for keratin production, the main protein in hair. However, direct evidence that collagen supplementation significantly improves hair growth, volume, or quality in otherwise healthy individuals is limited and often comes from studies with methodological limitations (e.g., small sample sizes, lack of placebo control). Most claims about collagen’s benefits for hair are extrapolated from its known effects on skin or from animal studies. Overall, while there is some scientific rationale and preliminary evidence supporting collagen's use for hair health, the evidence is not robust or definitive.

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