The Best NIOD Products To Use Space NK As we age, our skin's performance decreases. Give the gift of healthy looking skin. Copper Amino Isolate Serum 3 1:1 is a foundational copper peptide (1% GHK and 1% GHK Cu) serum to restore Core Collection Whats the difference between our copper peptide formulations? , Copper Amino Isolate Lipid 1% (CAIL 1%) is our intensely pro repair, patented copper peptide gel to regenerate skin volume and