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is glutathione an amino acid Glutathione: Master Antioxidant, Reducing Oxidative
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American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

But as you saw, the scientific literature shows that treatment with massive doses of B12, leading to very high blood levels, is 100% safe

It should be noted that any unapproved drug or substance may be considered prohibited by WADA at any time
B12s most prestigious role is in the methylation cycle, which co-stars Folic Acid

Patients may report numbness, tingling, balance problems, or memory issues
