GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not Amazon.com: GHK Cu Copper Peptide Serum Anti Aging Face Serum for Skin Firming, Wrinkle Reduction, Hydration & Collagen Boosting, 30ml(1 fl oz) : Beauty & Personal Care GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia GHK Cu and Reproductive Health: Mechanisms, Fertility Benefits GHK CU, Why this audio? Because injecting feels like a constant wasp sting so it takes me about 15 seconds to pin .2 mL. I dread this shot every night for that reason. Also, it leaves me bruised, so I