is injectable ghk cu better than topical Unfortunately, GHK-Cu can sting, irritate and leave lumps or a small rash at the injection site. This happens because GHK-Cu (Copper Tripeptide-1) a small, positively charged molecule that can cause temporary EP0983300B1 - Bpc peptide XS Retatrutide:30mg Vial + BAC Water 3ml
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