It is progressing through Phase 3 clinical trials
The human digestive system quickly breaks down water soluble compounds such as glutathione, so eating glutathione rich foods or taking oral glutathione supplements may not produce any clinically significant results
Free radicals and other oxidants are reduced by the direct action of GSH and indirectly via enzyme glutathione peroxidase, which use GSH as a cofactor
doi:10.1056/NEJMoa2502081 Enebo LB, Berthelsen KK, Kankam M, et al
Similarly, knowing the best foods to eat on semaglutide supports both weight loss and nutritional adequacy
Put simply: NAD is about generating cellular energy and repairing what's broken, while glutathione is about cleaning up and protecting cells from damage in the first place