Vitamin B12, also known as cobalt amine, is a polycyclic compound containing 3 cobalt, and four reduced pyridoxine rings are linked together to become a grunt ring (similar to nicotin), the only vitamin containing metallic elements. Vitamin B12 is a red crystalline powder, odorless and odorless, slightly soluble in water and ethanol, the most stable and strong acid (pH) under pH of 4.5 to 5.0 weak acid conditions
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