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If you have a known copper allergy (sometimes identified through reactions to copper jewelry), patch test any GHK-Cu product on your inner forearm for 48 hours before applying it to your face
Your research is only as good as the materials you use
Since the early 1990s researchers have been testing whether that same protective signalling does anything elsewhere: rodent and cell studies have looked at whether it prompts new blood vessels to grow into damaged tissue, since a fresh blood supply is what lets repair get started at all
2020 Nov;91(11):1201-1209
Reduced exercise performance or difficulty maintaining productivity under high demands
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