What it is
Acetyl tetrapeptide-5 is a short signal-type peptide composed of four amino acids with an acetyl group added to improve stability. It is incorporated into cosmetic formulations, including some sunscreens, as a conditioning ingredient. Like other synthetic peptides it is used at very low concentrations.
Safety & warnings
Acetyl tetrapeptide-5 is generally well tolerated at cosmetic use levels and is not associated with notable allergen or comedogenicity concerns.
Origin & sourcing
Synthetic; produced by peptide synthesis and acetylation.
Questions everyone asks
What kind of ingredient is acetyl tetrapeptide-5?
It is a synthetic short-chain peptide used as a skin-conditioning agent in skincare and sunscreen formulas.
Is it used at high concentrations?
No; peptides like this are typically used in very small amounts within a finished formulation.