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In vivo stimulation of connective tissue accumulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ in rat experimental wounds

And if you overdose on copper, you can actually get toxicity from it

Antioxidant Defense Copper ions bound to GHK provide potent antioxidant activity by neutralizing free radicals and supporting SOD enzyme functionprotecting cells from oxidative damage and premature aging

While it stimulated growth in some cells, it inhibited growth in others, leading to it being dubbed a modulating peptide.13 In the 1980s, it was established that GHK demonstrates a strong affinity for copper and readily teams up with the chemical element to form the complex GHK-Cu

Because of this, its become one of the hottest topics in anti aging science and cosmetic dermatology