<prompt> Source of vitamin B12?Animal sourcePlant sourceMilkFruits  <response>: Ans. a Animal SourceRef: Harrison 640Only source of vitamin B12 for humans is food of animal origin, e.g., meat, fish, and dairy products.Vegetables, fruits, and other foods of non-animal origin are free from cobalamin unless they are contaminated by bacteria. Cobalamin is synthesized solely by microorganisms. 