During the early titration phase when GI symptoms may limit exercise tolerance, walking is often the only practical option
Those results are in a different category of efficacy compared with B12 or many over-the-counter supplements
More specifically, research in WebMD states that, Taking glutathione by IV seems to help prevent nerve damage and other toxicities from the cancer drug cisplatin
After this period, the vial should be discarded regardless of appearance, since preservative-treated multi-use vials accumulate microbial burden over extended use periods that eventually exceeds the preservative's inhibitory capacity
DOI: 10.1016/S0981-9428(02)01455-9 33
You should incline it just a little, but if you tilt it up directly at you, you increase the risk of aspiration/choking