In the US, while several studies have been performed administering glutathione in various preparations to MCI patients - intravenously, intranasally (through nose), and orally - to date, with the preparations used, results have not been conclusive so as to have reliable benefits, said Maroon
The problem is that none of those tests look for bacterial overgrowth in the small intestine
Risk factors include vegetarian or vegan diets, age over 50 (reduced gastric acid impairs absorption), proton pump inhibitor use, prior gastric surgery, and Type 1 diabetes
This data can be found here: Author contributions PS: conceptualization and writing
Notably, as displayed in Supplementary Fig