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GHK-Cu, or glycyl-L-histidyl-L-lysine copper, is a small copper-binding peptide found naturally in the human body
The primary reported side effects are mild gastrointestinal discomfort (nausea, bloating) in 58% of users, which typically resolves with dose adjustment
Long-term low-dose maintenance is increasingly common for sustaining results
Weekly injections are formulated to maintain steady plasma concentrations over seven days, with peak levels occurring approximately one to two days after administration and gradually declining thereafter
Ann N.Y.Acad.Sci 2004;1033:168-176
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