Hi : ) CAIS is NIOD's Copper Amino Isolate Serum. It contains GHK peptides bound to copper which is known as copper peptides (GHK Cu) that are found in our plasma and are good The Ordinary Multi Peptide + Copper Peptides 1% Serum Space NK Biossance Squalane + Copper Peptide Rapid Plumping Serum N Acetyl Cysteine supplementation lowers high homocysteine plasma levels and increases Glutathione synthesis in the trans sulfuration pathway Italian Journal of Medicine