What it is
Acetyl hydroxyproline is based on hydroxyproline, an amino acid that is a structural component of skin proteins, modified with an acetyl group for improved stability. It is used as a conditioning agent intended to support a smooth, well-hydrated skin surface. It appears in moisturizers and daytime sunscreens as a supportive conditioning ingredient.
Safety & warnings
As an amino acid derivative, it is generally considered well tolerated and low risk for irritation at typical cosmetic concentrations.
Origin & sourcing
Synthetically produced acetylated derivative of the amino acid hydroxyproline.
Questions everyone asks
What is acetyl hydroxyproline?
It is an acetylated form of hydroxyproline, an amino acid found in skin structural proteins, used as a conditioning agent in cosmetics.
Does it rebuild collagen?
It is used as a skin-conditioning ingredient; claims about structural changes to skin proteins are not appropriate, and it functions to support surface feel and hydration.