Acetyl Tetrapeptide-2 is a synthetic signal peptide used in cosmetic formulations to support skin firmness and elasticity, with claimed effects on collagen and thymic-related skin renewal. It is typically included at low concentrations in serums and creams targeting signs of aging.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Rare | Occasional redness or stinging, usually formulation-related rather than from the peptide itself. |
Contact dermatitis or allergic reaction | Very rare | Isolated sensitivity reports; peptides are generally well tolerated. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.