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Do not use if you are allergic to GHK-Cu, copper peptides, or any ingredient in this cream (can cause rash or swelling)

A 2021 comparative bioavailability study found subcutaneous copper peptide administration achieved mean plasma AUC (area under the curve) values 1.6 higher than IM at equivalent doses, despite lower Cmax

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This variation is largely influenced by genetic differences in the enzymes responsible for its production and regeneration (1)