Copper peptide questions we get asked all the time How often should you use it? Do you need to avoid the sun? If you're new, start once daily (evenings are great), GHK Cu Topical Cream How long does it take GHK Cu to work? Entera Skincare GHK Cu Injectable Team Wellcore Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb Uses and Benefits #ghk GHK Cu is a naturally occurring peptide in human plasma that declines with age. When used in injections (usually subcutaneous), it can offer various benefits: Skin Rejuvenation and Anti Aging: