The percentage that reaches systemic circulation intact is estimated to be quite low, though exact figures for GHK-Cu specifically aren't well established in published literature
Apr 21st, 2026 How GHK-Cu Benefits Skin & Hair GHK-Cu is a copper-binding peptide with promising roles in skin regeneration and tissue repair, but its broader medical use is limited by insufficient human data, regulatory restrictions, and an incompletely defined safety profile
If you want the math handled for you, use the peptide reconstitution calculator
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