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Description GHK-Cu (Copper Peptide) is a tripeptide-copper complex (glycyl-L-histidyl-L-lysine:copper(II)), CAS 49557-75-7, molecular weight approximately 403.92 Da for the copper complex
"The effect of tripeptide-copper complex on human hair growth in vitro." Archives of Pharmacal Research
[5] Topical GHK-Cu is generally considered well tolerated, yet therapy should be avoided in individuals with a known hypersensitivity to copper peptides or any vehicle component
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