Fortified cereal This source of vitamin B12 may work well for vegetarians and vegans, as it’s synthetically made and not derived from animal sources (16). Although not commonly recommended as part of a healthy diet, fortified cereals can be a good source of B vitamins, especially B12. Food fortification is the process of adding nutrients that are not originally in the food. For instance, Malt-O-Meal Raisin Bran offer up to 62% of the DV for vitamin B12 in 1 cup (59 grams) . The same serving of this cereal also packs 29% of the DV for vitamin B6 and good amounts of vitamin A, folate, and iron.