The risks increase substantially when individuals self-administer research-grade products purchased from unregulated online sources
K.SuleymanZ.SuleymanB.MammadovR.BulutS.AltunerD.et al (2024)
Another review of studies related to prevention and management of CIPN cited moderate evidence in support of exercise for prevention (Dan 2024)
Glutathione has a long history of use as a dietary supplement in many markets around the world, and also as an active pharmaceutical ingredient in Japan.
"It's really important that scientific discoveries are translated from the bench cells, animals into humans through a series of clinical trials that prove at every step, with increasing numbers of subjects, that this product is effective, that it's safe, and that you know how much of it to administer." With files from Ariel Tozman
The short answer to the question of legality is: NO