GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health 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: Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference