Many: Vitamin B12 is important for many things including nerve function and the making of red blood cells. If you are low on it, therefore, you could have a low blood count or a numb/tingling sensation. Most adults need about 2.4 mcg (micrograms) daily. The main dietary sources are fish/meat, dairy products, and fortified cereals. Link for more info: http://ods.Od.Nih.Gov/factsheets/vitaminb12/.
Answered 11/27/2017
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Several: Primarily, B12 supports the production of red blood cells and supports the nervous system (brain, spinal cord, and all the nerves all over your body).
Answered 8/9/2017
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