Acetyl Tetrapeptide-40 is a synthetic signal peptide marketed to reduce skin redness and erythema by helping modulate inflammatory mediators and cytokine release. It is typically used in formulations targeting sensitive, reactive, or rosacea-prone skin.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient irritation or stinging | Rare | Occasionally reported on very sensitive skin, usually short-lived. |
Contact allergic reaction | Very rare | Peptides are generally low-allergenicity; isolated sensitivity possible. |
Redness or localized erythema | Very rare | Paradoxical reaction; uncommon given its anti-redness intent. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.