Copper peptide, in a broad sense, copper peptide is a complex of copper and peptide, including the most commonly used GHK-Cu, (GHK)2-Cu,AHK-Cu, (AHK)2-Cu, GRK-Cu,ARK- Cu, GRF-Cu,AHF-Cu, etc. Color: The general copper peptide refers to GHK-Cu, also called blue copper peptide/tripeptide-1
copper/blue copper peptide, which has blue and purple according to different proportions. While AHK-Cu is in the blue state, GHK-Cu has both blue and purple states.