Myristoyl Pentapeptide-17 is a lipidated signal peptide marketed to stimulate keratin gene expression in hair follicles, commonly included in eyelash- and eyebrow-conditioning formulations to promote the appearance of fuller, longer lashes. Evidence for efficacy is largely from manufacturer and in vitro data rather than robust independent clinical trials.
| Reported effect | How often | Notes |
|---|---|---|
| Mild eye or eyelid irritation | Uncommon | Stinging, redness or watering when applied near the lash line. |
| Contact dermatitis or allergic sensitization | Rare | Localized itching, redness or swelling in predisposed individuals. |
| Conjunctival redness or discomfort | Rare | Reported with accidental ocular contact of lash products. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.