A cosmetic 1% GHK-Cu serum will publish a purity figure on its CoA (Certificate of Analysis) but no endotoxin limit relevant to parenteral use, since it was never intended for that route [5]
A cysteine-specific lysosomal transport system provides a major route for the delivery of thiol to human fibroblast lysosomes: possible role in supporting lysosomal proteolysis
Because this method bypasses the digestive system, your body achieves faster and more effective absorption
doi:10.1016/s0091-6749(03)00010-1 16 Garcia-MaurioSGonzalez-HabaMGCalvoJRRafii-El-IdrissiMSanchez-MargaletVGobernaRet al
Lee YI, Lee SG, Jung I, Suk J, Lee MH, Kim DU
L-glutathione is a natural peptide compound made up of the three amino acids glutamic acid, cysteine and glycine