Is Palmitoyl pentapeptide-4 safe?
Tolerated in one 12-week trial only
BSome human evidenceCosmetic ingredientas of 2026-10-26
People tolerated the peptide well in the 12-week trial. Irritation did not differ between the treated and placebo sides. Finished products use it at very low levels. As with any topical ingredient, contact allergy is possible, but no one has specifically reported it. The FDA does not review cosmetic ingredients before sale. So reports after sale are the main safety signal. 14
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Citations
- Robinson 2005, Int J Cosmet Sci: topical palmitoyl pentapeptide provides improvement in photoaged human facial skin doi.org
- Katayama 1993, J Biol Chem: a pentapeptide from type I procollagen promotes extracellular matrix production pubmed.ncbi.nlm.nih.gov
- SpecialChem: palmitoyl pentapeptide-4 INCI ingredient entry specialchem.com
- FDA: how cosmetics are not FDA-approved but are FDA-regulated fda.gov
- FDA: is it a cosmetic, a drug, or both? fda.gov
Reference information only, not medical advice. Drawn from the Palmitoyl pentapeptide-4 article, fact-checked against the cited sources. No dosing anywhere on this site.