side affects of ghk cu PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r/SkincareAddiction A Dermatologist's Take on the

Free copper ions are toxic at high concentrations, but chelated within the GHK tripeptide, copper is delivered in a form that can serve as a co-factor for copper-dependent enzymes including lysyl oxidase (key for collagen cross-linking) and superoxide dismutase (key for antioxidant defence)

That's reassuring for short-term tolerability, but it's two people, not a population

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