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: Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK Cu Peptide Dosage How to Use Copper Peptides, Injections Neurogan Health GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B