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doi: 10.3389/fmolb.2021.761793
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
For how the research on GLP-1s and mood is shaping up more broadly, see our post on GLP-1 medications and mental health
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