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GHK-Cu Research Grade Copper Peptide (50 mg) GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper Complex) is a naturally occurring copper-binding tripeptide supplied as a research-grade compound intended exclusively for controlled laboratory and in-vitro research environments

PMC6822791 Molecular weight as the main determinant of lymphatic versus capillary absorption after subcutaneous injection

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This includes local testing as well as testing with third-party labs, which help bolster the claims of purity and potency, and back them up with COAs for every batch