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In Vivo Activity Duration and Dosing Implications The preclinical dosing regimen provides indirect evidence about the peptide's functional duration in vivo, though formal pharmacokinetic parameters remain unmeasured

Clinical studies consistently show peak results in this timeframe

Examples include semaglutide (Ozempic, Wegovy) and tirzepatide (Zepbound, Mounjaro)

Results do not stop when injections stop

The copper content of GHK-Cu formulations has been a theoretical safety consideration, given that excessive copper can be toxic - however, the amounts used in cosmetic and research applications are extremely small, the copper is tightly chelated by the peptide (reducing free copper availability), and topical absorption of copper from these products appears minimal and well below levels that would cause systemic copper accumulation or toxicity

A thorough medical history and physical examination by a qualified dermatologist is required