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GHK-Cu is a copper-binding tripeptide used as a cosmetic ingredient with supportive but less rigorous data

The possibility of sex differences in mitochondrial respiration has garnered much attention and speculation, but a recent meta-analysis, including 2258 participants from 50 studies, demonstrated an overall lack of sex differences 31

Unlike caloric restriction alone, which often results in both fat and muscle loss, the peptides mechanism specifically targets adipose tissue without promoting protein catabolism

The timeline is almost comparable whether you choose GHK-Cu topical vs injection options, since research shows injected GHK-Cu has poor bioavailability