AHK Cu Copper (1%) Copper Tripeptide Serum with Hyaluronic Acid (1.5%) Face and Scalp Serum FOUNTAIN Amazon.com: Neurogan AHK Cu Hair Elixir Expert Lightweight Copper Peptide Serum Spray for Hair & Scalp Care Cosmetic Moisturizer Spray, Made in USA2 oz : Beauty & Personal Care AnagenX AHK Cu vs GHK Cu Difference Between GHK Cu and AHK Cu 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