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Vitamin B-12, or Cobalamin, is the largest and most complex vitamin currently known to man. A slight deficiency of vitamin B-12 can lead to anemia, fatigue, mania, and depression, while a long term deficiency can cause permanent damage to the brain and central nervous system. Vitamin B12 can only be manufactured by bacteria and can only be found naturally in animal products, however, synthetic forms are widely available and added to many foods like cereals .
Vitamin B12 is a water-soluble vitamin that is naturally present in some foods, added to others, and available as a dietary supplement and a prescription medication. Vitamin B12 exists in several forms and contains the mineral cobalt [ 1-4 ], so compounds with vitamin B12 activity are collectively called "cobalamins". Methylcobalamin and 5-deoxyadenosylcobalamin are the forms of vitamin B12 that are active in human metabolism [ 5 ].
A unique essential nutrient, vitamin B-12 isn’t produced by plants, animals, or even fungi, instead being produced only by certain bacteria. Human requirements for vitamin B-12 as set by the Daily Recommended Intake (DRI) are 2-3 micrograms/mcg per day to upwards of 4-7 micrograms/mcg per day. [ 2 ] Naturally-occurring sources of Vitamin B-12 are found primarily in foods of animal origin and among fortified foods of vegetarian/vegan origin. If you are a practicing vegan, supplementation may be the best option for you to ensure you receive adequate to optimal daily intake.
Other body benefits : Not only do clams have the highest concentration of vitamin B12 of any food, they’re also filled with potassium . Three ounces of either canned or fresh clams contain 534 mg of potassium, 15% of your DV.