Cellular Glow Copper Peptide GHK Cu Serum for Face 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 Amazon.com: Neurogan GHK Cu (Copper Peptide) Neck & Face Serum 1,200mcg (1 oz bottle) : Beauty & Personal Care Copper Peptides for Effective Hair Growth GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction