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What vitamin B12 level is considered deficient
If your main concern is the constant feeling of tiredness or fatigue mainly caused by the deficiency of this vitamin, then you will be able to replenish your vibrancy with B12 as soon as a few days
If that is you, it is understandably worrying, but in almost all cases it is short-lived and harmless
Its core physiological function is to catalyze the methylation of nicotinamide (NAM, a key precursor for NAD+ synthesis) with Sadenosylmethionine (SAM) to produce 1methylnicotinamide (1MNA)
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