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Collagen

Also known as: Collagen peptides, hydrolyzed collagen, marine collagen

Weak EvidenceSupplementAndrogenic Alopecia

Popular protein supplement for skin and hair with no direct evidence for hair regrowth.

Regrowth Potential10%
Long-Term Viability40%

Mechanism of Action

Collagen supplements provide amino acids (glycine, proline, hydroxyproline) that are building blocks for connective tissue. Collagen supports the dermal layer surrounding hair follicles and may protect follicular stem cells from oxidative damage through its proline content, which can be converted to the antioxidant glutathione.

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