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Reported or proposed issue Drug or supplement interactions Evidence source Mechanism-based theory Known or theoretical
It is the most studied injectable peptide for musculoskeletal injuries
Its fast, efficient, and much more effective
Where it gets murky is the same place glutathione gets murky: "Varnya" in the classical texts is about radiance, clarity, and evenness of complexion, not a specific target shade, and a lot of modern marketing has stretched that older idea into "skin whitening" language the same way it's happened to glutathione
GHK-Cu is widely used in skin rejuvenation, hair restoration, wound repair, and whole-body anti-aging protocols
True copper allergy typically produces hives, swelling, or systemic symptoms beyond localized skin changes
