Vegetarian Dietary Guidelines - Vitamin B12

Plant foods are not a reliable source of B-12 for vegetarians. Vitamin B-12 in spirulina, sea vegetables, tempeh, and miso has been shown to be inactive B-12 analog rather than the active vitamin. Although dairy products and eggs contain vitamin B-12, research indicates that lacto-ovo-vegetarians have low blood levels of vitamin B-12. Thus use of fortified foods or supplements are advised for vegans or vegetarians who limit animal foods.