The most requested peptides are Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7 (Matrixyl 3000), Acetyl Hexapeptide-3 (Argireline), Copper Tripeptide-1 (GHK-Cu), and Syn-Ake (Dipeptide Diaminobutyroyl Benzylamide Diacetate). Each has specific pH and temperature stability requirements your cosmetic chemist should confirm before finalizing the formula.
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