<prompt> Which vitamin is supplied from only animal source:Vitamin CVitamin B7Vitamin B12Vitamin D  <response>: Ans. c Vitamin B12 Ref: Harrisons 19th ed. P 640 Vitamin B12 Cobalamin is synthesized solely by microorganisms. In humans, the only source for humans is food of animal origin, e.g., meat, fish, and dairy products. Vegetables, fruits, and other foods of nonanimal origin doesnt contain Vitamin B12 . Daily requirements of vitamin Bp is about 1-3 pg. Body stores are of the order of 2-3 mg, sufficient for 3-4 years if supplies are completely cut off. 