Not all copper peptide serums are formulated the same Before you buy one, make sure you're actually getting pure GHK Cu at the right concentration not just a diluted blend. We spent Copper Peptide GHK Cu for Sale Stanford Advanced Materials Amazon.com: Neurogan GHK Cu (Copper Peptide) Neck & Face Serum 1,200mcg (1 oz bottle) : Beauty & Personal Care Ghk Cu Serum Peptides Intensive Serum Tripeptide 1 Ghk Cu Copper Peptide Acetyl Hexapeptide 8 Intensive Repair Reduces Wrinkle G 1% GHK CU Copper Tripeptide Serum w Hyaluronic Acid Niacinamide GHK Cu 50mg Copper Tripeptide Research Compound 99%