Cyanocobalamin is the preferred supplemental form of vitamin B 12 as there is insufficient evidence to support the efficacy of the other forms like methylcobalamin. Michael Greger MD, How Not to Die. Cyanocobalamin: Package Insert Prescribing Information Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical Best Vitamin B12 Injections Dosage And Frequency PA Relief
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