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O'Collins VE, Macleod MR, Donnan GA, Horky LL, Van Der Worp BH, Howells DW
What does GHK Cu do to collagen

More rigorous clinical studies are needed to determine its safety and efficacy

Also, liver enzymes such as aspartate transaminase and alanine transaminase had a significant decrease in the IF group (Tavakoli et al., 2025)