Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches Copper Peptides GHK Cu Beef Tallow for Skin: Blue Balm with Methylene Blue, Manuka Honey & Vitamin E Natural Face and Body Moisturizer for Mature, Dry & Sensitive Skin 2oz Blue Copper Peptide (GHK Cu) Guide: Anti Aging Science, Formulation & OEM GLUTATHIONE: IMMUNOCAL Devon McGregor