The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Wellness peptide craze: why people are injecting drugs 'not for human consumption' Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum