best absorbed glutathione is by the skin Time To Take liposomal glutathione absorption study Oral – Dr. Colbert, MD Nano Reduced

So can glutathione

they are summarised here for the benefit of researchers designing in-vitro or animal studies

Possibly, the consistent endothelium protection during advanced healing processes in different wounds of various tissues, including blood vessels [1,2,1017], associated with the counteraction of the L-NAME-induced disturbances as well as the counteraction of the L-arginine-induced disturbances, obtained with the same BPC 157 dose range [14,15,1826], should likely compete with the prominent endothelium effect of the heparin-impaired endothelial nitric oxide (NO) synthesis [36] as well as warfarin endothelium damage [37]

Subcellular localization and properties [PMID: 6375723] Laboratory literature summary: The renal thiol (glutathione) oxidase