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GHK-Cu is the pre-formed 1:1 complex of that tripeptide with a copper ion

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Estimates suggest oral bioavailability for peptides like BPC-157 may be only 1-2%, meaning massive doses would be required to achieve systemic effects

Hidaka S, Kranzlin B, Gretz N, Witzgall R (2002) Urinary clusterin levels in the rat correlate with the severity of tubular damage and may help to differentiate between glomerular and tubular injuries

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