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Int J Mol Sci 21(14):114
The dysesthesia question One side effect unique to retatrutide deserves special attention
Overview GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper complex) is an endogenous tripeptide that binds copper(II) ions with high affinity and is present in human plasma at concentrations that decline markedly with age from roughly 200 ng/mL at age 20 to approximately 80 ng/mL by age 60
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