Methylcobalamin is a Coenzyme form of vitamin B12 which is biologically active. It is the form of Vitamin B12 that is active in the central nervous system and is essential for cell growth and replication. Other forms of B12, such as cyanocobalamine, require conversion to methylcobalamin by the liver, and evidence suggests that some people may not make this conversion efficiently.
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Revital VITB12 Solgar