can ghk cu cause acne Copper Peptides for Skin: Benefits and How to Use Them GHK-Cu is one of the

You should speak with your healthcare provider if you experience any of these symptoms

Relative contraindications requiring caution include active or suspected cancer (GHK-Cu promotes angiogenesis with concern about theoretically feeding tumors, though conflicting data shows documented anti-cancer gene expression effects requiring medical supervision), severe organ dysfunction (kidney or liver failure may slow peptide clearance), hemochromatosis or copper overload conditions, autoimmune disorders, and patients on immunosuppressants or blood thinners

PMID 21719467

Start conservatively at 0.25 mg daily for the first week to assess tolerance before increasing to 0.5 mg if needed

You may need to have further blood testing