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The plastic and rubber in syringes can sometimes interact with the peptide, and theres a higher risk of contamination and dosage inaccuracy over time
154947-66-7 GHK-Cu (Copper Peptide) Mol

[DOI] [PMC free article] [PubMed] [Google Scholar] 63.Ou X.H., Zhu C.C., Sun S.C

GHK-Cu is a naturally occurring copper compound that was first discovered in human plasma
