Palmitoyl tripeptide-1 (a Matrixyl component) and copper peptide GHK-Cu are widely used because they remain stable in the pH 4.5–6.5 range typical of wash bases. Argireline (acetyl hexapeptide-3) is popular for anti-aging claims but is more sensitive to heat and pH swings. A cosmetic chemist on AJ Cosmo Labs can recommend peptides matched to your claims and budget.
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