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MethylcobalaminHealthy Homocysteine MetabolismSupports Healthy Nervous SystemA Dietary SupplementVegetarian/VeganKosherHalalHow It Works: Vitamin B12 has the largest and most complex chemical structure of all the vitamins. Most of its functions are related to its co-enzyme activity such as enzymes required for the production of DNA during cell division as well as for the proper disposal of homocysteine. B12 is also necessary for the maintenance of a healthy nervous system.