Most skincare stays on the surface., GHK Cu works deepersupporting your skin at the cellular level without the irritation cycle of retinol., No redness., No downtime., Just real support where it Copper Peptides vs Retinol: Do You Need Both? Nubeean Noosa Peptides vs. Retinol Which is Better For Skin Health? Everything you need to know about GHK Cu WHAT IS IT? A copper peptide your body naturally produces but production drops by 60% by age 60. It's one of the most Intensive Anti Aging Serum with Copper Peptide(GHK Cu) and Hyaluronic Acid