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GHK-Cu Side Effects Topical GHK-Cu is generally well-tolerated by most skin types, but some individuals may experience mild irritation
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It inhibits NNMT (nicotinamide N-methyltransferase), an enzyme regulating metabolism, fat storage, and NAD+ consumption.[4][27][6] NNMT methylates nicotinamide, a NAD+ breakdown product, diverting it from recycling and reducing available NAD+
Network meta-analysis showed no evidence of differences among all possible comparisons for secondary outcomes (MCV, homocysteine levels, platelet counts, and WBC counts)
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