Everything you need to know about GHK Cu WHAT IS IT? A copper peptide your body naturally produces but production drops by 60% by age 60. It's one of the most Injectable GHK Cu: Beginner's Guide to Copper Peptide GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 9 months of consistency with a protocol that works systemically, not superficially. This has included GHK Cu subcutaneous and topical, collagen, protein and an intentional lifestyle ticking off the essentials of sleep, training,