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Nitrous oxide can also deplete B12 levels

Because NAD+ and glutathione are nutrients and not drugs, there are no known negative side effects, and you dont need a medical prescription

Arch Biochem Biophys 1983, 223: 381-392

When cyanocobalamin enters your body, its converted into either methylcobalamin or adenosylcobalamin, which are the two active forms of vitamin B12 in humans ( Unlike cyanocobalamin, methylcobalamin is a naturally occurring form of vitamin B12 that can be obtained through supplements, as well as food sources like fish, meat, eggs, and milk (3, SUMMARY Cyanocobalamin is a synthetic form of vitamin B12 found only in supplements, while methylcobalamin is a naturally occurring form that you can get through either food sources or supplements

Lab Anim 2007;41:1119

doi:10.22092/ari.2021.356055.1767 Forman HJ, Zhang H, Rinna A