Myristoyl Tetrapeptide-34 is a lipidated synthetic peptide used in cosmetic formulations, marketed for skin-conditioning and to support a smoother, more even-looking skin surface. As a relatively new and proprietary ingredient, it lacks extensive independent peer-reviewed safety and efficacy data.
| Reported effect | How often | Notes |
|---|---|---|
| Mild local irritation or redness | Rare | Peptides are generally well tolerated; transient irritation may occur, often related to the overall formulation rather than the peptide itself. |
| Contact sensitization / allergic reaction | Very rare | Theoretical risk common to peptide and protein-derived ingredients; few documented cases. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.