GHK-Cu and AHK-Cu are both copper-associated tripeptides, and the structural similarity between them is the source of most of the confusion. They share two of three amino acids and both bind copper, but they are not the same molecule. GHK-Cu is glycyl-L-histidyl-L-lysine complexed with copper. AHK-Cu is alanyl-L-histidyl-L-lysine complexed with copper. The first amino acid…

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