Aesthetics Infinity Medical Institute Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? My skin spot on GHK Cu : r Biohackers For those of you that take ghk cu, why is this so bad? It's never been this bruised. But is always swollen, red, and burns like hell. I can only tolerate every other If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms