What it is
Hydroxyproline is a modified amino acid that is a major structural component of collagen, where it helps stabilize the protein's triple-helix. In cosmetics it is used as a skin-conditioning and moisture-supporting ingredient and is often included in formulas positioned around skin firmness and suppleness. It is water-soluble and typically used at low levels.
Safety & warnings
Hydroxyproline is an amino acid that is generally well tolerated on skin and is not associated with notable irritation or comedogenicity at typical use levels.
Origin & sourcing
Hydroxyproline used in cosmetics is generally produced synthetically or by fermentation to ensure consistent purity, though the amino acid occurs naturally as a component of collagen.
Questions everyone asks
What is hydroxyproline's role in skincare?
It is a collagen-associated amino acid used as a skin-conditioning and moisture-supporting ingredient in many supple-skin formulas.
Is hydroxyproline the same as collagen?
No, it is a single amino acid that is one of collagen's main building blocks rather than the whole collagen protein.