GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B This peptide reverses aging, And its been hiding in plain sight for decades., GHK Cu (Copper Peptide) is one of the most researched anti aging ingredients out there., Heres what it does:, 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 vs NAD+: Which Longevity Peptide Should You Take or Stack?