No single source: There are many different types of b vitamins. B 12 is present only on animal proteins, including dairy. Most of other vitamins are present in vegetable and meat sources, and a balanced diet rich in vegetables and fruits will provide adequate amounts. See this site for more info. http://www.nlm.nih.gov/medlineplus/bvitamins.html.
Answered 1/20/2013
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