I can tell you since I have been taking Glutathione it has helped my digestive system.
Nothing bothers me now, can eat anything.
https://drhyman.com/blog/2010/05/19/glutathione-the-mother-of-all-antioxidants/
I used to buy on Amazon, but I do not buy a thing from them anymore, especially since he gave 100,000,000 to a stated commie!
https://www.allstarhealth.com/f/now-glutathione_250mg.htm
Glutathione contains sulphur,I am allergic to Sulphur.