Injectable GHK Cu: Beginner's Guide to Copper Peptide Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule GHK CU, Why this audio? Because injecting feels like a constant wasp sting so it takes me about 15 seconds to pin .2 mL. I dread this shot every night for that reason. Also, it leaves me bruised, so I GHK Cu Copper Peptide Face Tonic for Firmer Looking Skin GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?