Not all copper peptides are equal. Here's why ours is different., We compared our GHK Cu Serum to The Ordinary's version so you don't have to., Ours: 1.2% concentration. Delivery system at ingredient AHK Cu vs GHK Cu Difference Between GHK Cu and AHK Cu Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs GHK CU Copper Peptide Serum 3% Anti Aging & Firming Skin Serum VALNCIA 30ml MELAO Ghk cu Copper Peptide Serum Face Neck Tightening Facial Serum Ghk cu Serum Snap 8 Blue Copper Peptide Serum for Skin Care Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Jumbo Size Biossance