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B12 overdose symptoms include skin rashes, itching, upset stomach (nausea, vomiting, diarrhea), b12 overdose headache, and feeling anxious or nervous
Miller, T

VITAMIN DEFICIENCY INJECTABLE SYSTEM - B12- cyanocobalamin IT3 Medical LLC ---------- Cyanocobalamin Injection (vitamin B12) is a sterile solution of Cyanocobalamin

Nature 583 , 585589 (2020)
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)