beetroot has glutathione Effect of juice intake on (a) peroxidase (GPx), Beetroot Juice Benefits for Men:

Identity and purity of every batch - including HPLC purity, appearance, and relevant physicochemical parameters - are documented on the lot-specific Certificate of Analysis, available on request to support formulators' own specification and QC programs

Bands provide variable resistance that adapts to different positions

Ren S, Xu Y, Dong X, Mu Q, Chen X, Yu Y, et al

Although our fresh epithelial brushing cell GSH data could have been influenced by nonepithelial (inflammatory) cell contributions, the percentages of these cell types in the brushings are typically less than 10% of total cells, and there was no correlation of BAL inflammatory cells and BAL GSH or GSSG