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 Cu Peptide: What It Does for Body Composition and Metabolic Health Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. Westend Medical Supply GHK Cu Focal Point Vitality GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK Cu Glow Peptide Stack for Skin Rejuvenation Jennifer R. Berman MD