Skin Health
One preclinical study investigated the effects of oral ingestion of hydrolyzed collagen, along with vitamin C and glucosamine, on the skin properties of women tending to have dry and rough skin. This study suggested that, with the ingestion of 5g per day during 6 weeks, the moisture content of the skin, its viscoelastic properties and its smoothness improved.[5]
Regarding the mechanism of action of hydrolyzed collagen on skin, it seems that orally ingested hydrolyzed collagen increases the density of collagen fibrils and the fibroblasts density (the fibroblasts being the main cells of the dermis, and the ones which produce collagen).[6] The explanation of this action may be that the peptides of ingested hydrolyzed collagen have chemotactic properties on fibroblasts [7] or an influence on growth of fibroblasts
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