Collagen: the benefits for hair.

Collagen is a protein naturally found in the body. Synthesised by fibroblasts, it provides mechanical resistance to stretching and structure to many connective tissues. This is why collagen is present in the skin, muscles, bones, ligaments, tendons, and even hair. This active ingredient is also found in cosmetic formulations, where it is particularly used to create hair care products.

To date, there are no clinical trials on the benefits of collagen in hair applications.

It can nevertheless be assumed that collagen could provide hydration to the hair. Indeed, it has been shown that this compound forms a film on the skin, allowing it to be protected and to limit insensible water loss. A similar mechanism can be assumed on hair fibres, where collagen could act in support of the hydrolipidic film, synthesized at the scalp level and enveloping the hair.

Furthermore, some researchers have shown that collagen possesses anti-radical properties and can protect skin cells. It is possible that this antioxidant activity also occurs at the level of hair follicles, which are located at the root of the hair and are sensitive to attacks from free radicals. The repeated action of these unstable molecules can disrupt the process of melanogenesis and accelerate the appearance of grey hair. Additionally, free radicals can interfere with the hair cycle and precipitate hair loss. It can thus be hypothesised that collagen could potentially help prevent these issues and protect the scalp and hair fibres.