concentration of glutathione in plama Oral Administration S-acetyl-glutathione: Impact on the Levels of Plasma and in Erythrocytes of Healthy Volunteers : Figure 2 Determination of glutathione and glutathione
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Life Sci 218:165184

however, while they reduce glutamine uptake, they do not exclusively inhibit the ASCT2 function [107]

[DOI] [PMC free article] [PubMed] [Google Scholar] 150.Li Y., Ma L., Deng Y., Du Z., Guo B., Yue J., Liu X., Zhang Y

It's like, oh, well, should it be getting into your brain

I think is what it comes down to

The mechanism of CYP is a complex cascade of individual steps involving the interaction of protein redox partners and consumption of reducing equivalents, usually in the form of NADPH
