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Further, long-term use of acid-reducing drugs and the anti-diabetes drug metformin and repeated exposure to nitrous oxide have been implicated in vitamin B 12 deficiency (see Drug interactions)

The how much question has two parts: concentration and frequency

[205] Preparation of the reduced forms of vitamin B12 and of some analogs of the vitamin B12 coenzyme containing a cobalt-carbon bond

Good vitamin B12 therapy can make you feel more energetic, improve your brain function, and overall, make you feel better

It may be safe to state that suitable supplementation is protective and side effects of taking vitamin B12 supplements is highly unlikely

Vegans and vegetarians sometimes have trouble consuming enough B12 since many food sources are found in animal products like meat and dairy