Palmitoyl Pentapeptide-4 (Matrixyl, pal-KTTKS) is a lipidated peptide that signals fibroblasts to increase production of collagen, elastin, and other extracellular matrix components. It is used in topical formulations to help reduce the appearance of fine lines and improve skin firmness.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient irritation or redness | Rare | Generally well tolerated; minor irritation occasionally reported, often related to the overall formulation. |
Contact dermatitis or allergic sensitization | Very rare | Isolated reports; the palmitoyl chain and peptide are considered low-sensitizing. |
Stinging or itching upon application | Rare | Typically subsides quickly and may be linked to other ingredients in the product. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.