Copper Tripeptide 1 GHK Cu 1% Solution 1% GHK CU solution: is this applied directly on skin or diluted further? : r DIYaesthetics When a product says copper peptides it's worth checking the ingredient list. Copper peptides (like **Copper Tripeptide 1 GHK Cu**) are signaling ingredients that can support collagen processes in the skin. But not Copper Peptide GHK Cu Tablets 2 mg (60 Tabs) Research Grade Copper Tripeptide 1 > Peptides > 99PURITY