What it is
Acetyl Tetrapeptide-15 is a synthetic signal peptide composed of four amino acids with an acetyl group at the terminus. It is used in cosmetic formulas as a skin-conditioning agent and is frequently marketed for its purported soothing or comfort benefits on sensitive or reactive skin. It is included at low concentrations in serums and sun-protection products.
Safety & warnings
Cosmetic peptides such as acetyl tetrapeptide-15 are used at very low concentrations and are generally well tolerated, with low irritation and comedogenicity potential.
Origin & sourcing
Synthetic; it is a laboratory-made peptide produced for cosmetic use.
Questions everyone asks
What is a signal peptide?
It is a short chain of amino acids used in cosmetics as a conditioning ingredient; acetyl tetrapeptide-15 is marketed primarily for its soothing, comforting benefits.
Does this peptide provide SPF?
No. It is a skin-conditioning peptide and does not contribute UV protection.