Acetyl Tetrapeptide-3 is a synthetic biomimetic peptide used in cosmetic formulations, often marketed to support hair anchoring, follicle health, and extracellular matrix proteins. It is also included in some skincare products for its purported effects on dermal matrix and skin firmness.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or redness | Rare | Generally well tolerated; transient irritation possible in sensitive individuals. |
Contact allergic reaction | Very rare | Isolated reports; peptides are considered low-sensitizing. |
Localized itching or stinging | Rare | Usually formulation-dependent rather than peptide-specific. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.