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

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Synopsis

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

Collagen (mixed types, such as types I, II, and III) is commonly marketed as a supplement to support hair health, strength, and growth. Scientific evidence supporting collagen's role in hair health is emerging but remains limited. Collagen is a structural protein found in skin, nails, and connective tissue, and it provides amino acids like proline and glycine, which are components of keratin, the main protein in hair. Some laboratory and animal studies suggest that collagen peptides can support skin and hair health by providing building blocks for these tissues and by potentially reducing oxidative stress that can damage hair follicles.

However, robust human clinical trials specifically demonstrating that oral collagen supplementation directly improves hair growth, thickness, or strength are scarce. Most available studies focus on skin and joint health, with hair benefits extrapolated from improvements in skin elasticity or structure. A few small human studies and anecdotal reports suggest possible benefits, but these are not yet conclusive. Therefore, while there is a scientific rationale and some preliminary evidence, the overall level of direct scientific validation for collagen's effectiveness in supporting the hair body system is moderate at best.

In summary, collagen supplementation for hair health is justified by emerging but not definitive scientific evidence. More rigorous, large-scale human studies are needed to confirm its efficacy for this use.

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