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A legitimate COA should confirm identity by HPLC or mass spectrometry, purity above 98 percent, copper content consistent with the theoretical chelate ratio for the GHK-Cu complex (verifiable against the molecular formula), and absence of heavy metal contaminants

Injection Site Reactions: Although less common, some patients have reported reactions at the injection site

Copper Peptide GHK-Cu in 2026: Evidence-Based Review of Mechanisms, Benefits, and Safety By Isaac Introduction Copper peptide GHK-Cu, also known as glycyl-L-histidyl-L-lysine copper complex or copper tripeptide-1, has garnered significant interest in dermatology and regenerative medicine for its potential roles in skin repair, anti-aging, and wound healing

Each serving also includes vitamin C to complement antioxidant support