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Injectable GHK-Cu offers higher bioavailability than topical formulations
GHK-Cu is the copper peptide most referenced in dermatology reviews and wound healing literature
J Chem Soc Trans
It contains benzyl alcohol, preventing contamination during multiple vial withdrawals
Based on available Phase 2 data, both agents share a side-effect profile broadly consistent with other medicines acting on metabolic hormone pathways, though the triple-agonist mechanism of retatrutide introduces some additional considerations
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