Effective usage levels vary by peptide class. Signal peptides like Palmitoyl Tripeptide-1 are typically active at 0.5–3%, Argireline (Acetyl Hexapeptide-3) at 3–10%, and copper peptide GHK-Cu at 0.5–2%. Exceeding recommended levels rarely improves performance and significantly increases COGS. A cosmetic chemist on AJ Cosmo Labs can recommend the optimal concentration for your target claim and price point.
Read the full guide on Peptides in skincare →