Experiencing fatigue might signal low vitamin B12 levels. Vital for nerve function and red blood cell formation, this nutrient is found in foods such High b12 foods include clams, fish, crab, low-fat roast beef, fortified soymilk, fortified cereal, fortified tofu, low-fat dairy, cheese, and eggs. The current daily value (DV) for vitamin B12 is 2.4mcg. Vitamin B12 is an essential nutrient. Here are the best food sources of vitamin B12 , as well as fortified alternatives for vegetarian or vegan diets. Best Vitamin B12 Rich Foods & their Benefits: Learn more about the foods containing vitamin B12, fruits, vegetables, and meat options, their benefits and symptoms of deficiency.