| Message: | Vitamin B12 is a cyanide ion substituted cobalamin derivative (cyanocobalamin) with the presence of cobalt mineral at 6 position. Vitamin B12 is the only vitamin which contains metal ion (trivalent cobalt). Cobalamin is sometimes defined as the synonym of Vitamin B12, although they are not same compound but closely related compounds to fulfill folic acid role. Vitamin B12 is typically any substituted cobalamin derivative having similar biological activity. Hydroxocobalamin (abbreviated OHCbl), a cobalamin derivative in which the substituent is a hydroxyl group, is called vitamin B12b.
Vitamin B12 is a water soluble with a key role in the normal functioning of the and , and for the formation of . It is one of the eight . It is normally involved in the of every of the body, especially affecting synthesis and regulation, but also synthesis and energy production.
Vitamin B12 is the name for a class of chemically-related compounds, all of which have vitamin activity. It is structurally the most complicated vitamin. of the basic structure of the vitamin can only be accomplished by , but conversion between different forms of the vitamin can be accomplished in the human body. A common synthetic form of the vitamin, , does not occur in nature, but is used in many pharmaceuticals, supplements and as food additive, due to its stability and lower cost. In the body it is converted to the physiological forms, and leaving behind the albeit in minimal concentration. More recently, methylcobalamin and, adenosylcobalamin can also be found in more expensive pharmacological products and food supplements. The utility of these is presently debated.
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