glutathione concentration in body A Targeted Metabolomic Assessment of Oral Bioavailability and Safety Humans: A Randomized Crossover Clinical Trial Glutathione IM | The Center
Description
First and foremost, adopting a diet rich in sulfur-containing amino acids like cysteine, found in foods like garlic, onions, eggs, and cruciferous vegetables, provides the building blocks for glutathione synthesis

Reference Module in Biomedical Sciences
It is also US FDA GRAS-certified and uses non-GMO yeast for fermentation- making it highly safe for daily use

The assay monitors NADPH oxidation to NADP + via absorbance decrease at 340 nm
