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The closest human data is from CB4211, an analog that completed a Phase 1a/1b safety trial (NCT03998514) with well-tolerated SubQ dosing and favorable liver-enzyme and glucose trends

GHK-Cu is the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine (GHK)

A large proportion come from China, where imports of hormone and peptide compounds have increased dramatically: US customs data shows they hit $328m in the first three-quarters of 2025, up from $164m in the same period the previous year, the New York Times reported

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Blood cell production typically begins improving within 35 days, haemoglobin rises over 12 months, whilst neurological recovery may take several months

10.1016/j.immuni.2017.03.022 52 KumarA.SidhuJ.LuiF.TsaoJ