Collagen
Collagen is a fibrous protein comprising approximately one third of total protein in mammalian organisms, consisting of a polypeptide with three peptide chains rich in proline and hydroxyproline (CAS# 9007-34-5). In cosmetics, it is typically derived from animal sources such as fish or bovine skin. As a large protein molecule, it functions primarily as a surface-level humectant and skin conditioner when applied topically. It also serves a hair conditioning role per its official CosIng listing.
Topical collagen is primarily associated with skin hydration rather than structural anti-aging effects, as the molecule is too large to penetrate the skin and stimulate endogenous collagen production. It acts as a moisturizer/humectant on the skin's surface, helping to attract and retain moisture.
The source does not note any specific cautions or contraindications for topical collagen use.
