You require at least 2.6 mcg per day. Vitamin B12 (Cobalamin) is needed for red blood cell production, neurological development and DNA synthesis in both you and your baby.
Best food-based sources of B12 include organ meats, eggs, fish, beef, fortified breakfast cereals and some dairy. If you are a vegetarian, you might have a low level of Vit. B12 and supplementation is a good idea. If you are concerned that you may be deficient in this important vitamin, ask your health care provider to order a blood test to measure your Vit. B12 level.