ghk-cu injection human trial Peptides Before and After: Dosage, Benefits & How It Works for Skin and Hair Does GHK-Cu Really Work? 40
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So, you have to take them at a different time, at least with an interval of 4 to 6 hours

So why do some researchers still take breaks from GHK-Cu

Benefits of B12 Injections: Significantly reduces fatigue and increases sustained energy levels

Several of the changes observed in connective tissue are thought to reflect variations in the levels of MMPs, the enzymes involved in regulating and maintaining the extracellular matrix that degrade extracellular matrix molecules, proteoglycans, elastin, and different types of collagens [109]
