Palmitoyl pentapeptide-4, widely known by its trademarked name Matrixyl, is a lab made chain of five amino acids attached to a fatty acid that helps it penetrate skin.
It was designed to mimic a fragment of collagen and elastin, signaling to skin cells that repair is needed and prompting them to ramp up their own collagen production. In a clinical study published by its original researchers, women who applied a cream containing this peptide for twelve weeks saw a measurable reduction in wrinkle depth and surface area compared to a placebo cream.
Because the peptide fragment itself is a naturally inspired signal rather than a foreign substance, it is generally considered gentle and well tolerated.
Palmitoyl Pentapeptide-4 (Matrixyl) References
Topical Palmitoyl Pentapeptide Provides Improvement in Photoaged Human Facial Skin, International Journal of Cosmetic Science, 2005
Safety Assessment of Myristoyl Pentapeptide-4, Palmitoyl Pentapeptide-4, and Pentapeptide-4 as Used in Cosmetics, Cosmetic Ingredient Review Expert Panel, 2023
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.
