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Researchers originally identified GHK-Cu in human plasma in 1973 "for its ability to help older liver tissue behave more like younger tissue, said Jen Messer, a researcher, registered dietitian and president of the New Hampshire Academy of Nutrition and Dietetics

rather, the choice is dictated by the specific hypothesis under investigation

This compound is heavily studied across cellular biology, cosmetics engineering, and tissue model assays

CJC 1295 without DAC (also called Modified GRF 1-29) carries amino acid substitutions at positions 2, 8, 15, and 27 that resist DPP-IV cleavage, giving a half-life of roughly 30 minutes

The concentration of glutathione varies across different tissues

Copper Toxicity Concerns Because GHK-Cu contains copper, some individuals have questions about copper metabolism and the risk of toxicity