Skin
Peptides in skin care: what to expect
Signal peptides, copper peptides, and “Botox-like” topical actives—realistic expectations for serums and creams.
Signal peptides
Ingredients like Matrixyl (palmitoyl pentapeptide-4) are marketed to support collagen-related signaling. Evidence is modest but real in some clinical cosmetic studies—think gradual firmness over weeks, not overnight transformation.
Expression-line peptides
Argireline and SNAP-8 are often compared to “topical Botox.” They aim to soften the look of expression lines by influencing muscle-adjacent signaling. Results are subtle; they are not injectable neuromodulators.
Copper peptides
GHK-Cu and copper peptide blends show up in repair serums and The Ordinary-style cocktails. They are popular for post-procedure and anti-aging routines; patch-test if you are reactive.