Copper peptide questions we get asked all the time , How often should you use it? Do you need to avoid the sun?, If youre new, start once daily (evenings are great), then build up if your skins GHK Cu Revival Clinic 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: GHK Copper Peptide GHK Cu Tripeptide 1