Also known as: Collagen peptides, hydrolyzed collagen, marine collagen
Popular protein supplement for skin and hair with no direct evidence for hair regrowth.
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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