Peptides are short chains of amino acids used in skincare to signal skin cells, support collagen production, and improve the appearance of fine lines and firmness. Different types (signal, carrier, neurotransmitter-inhibiting, and enzyme-inhibiting peptides) target different aspects of skin aging and barrier function.
| Reported effect | How often | Notes |
|---|---|---|
| Mild irritation or redness | Uncommon | Usually transient and often related to other ingredients in the formulation rather than the peptide itself. |
| Contact dermatitis or allergic reaction | Rare | Sensitization is possible but infrequent; patch testing is advisable for sensitive individuals. |
| Itching or stinging on application | Rare | More likely with broken or compromised skin barrier. |
| Systemic effects | Very rare | Topical peptides have limited skin penetration, so systemic absorption and effects are generally negligible. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.