You definitely need b12. nobody denies the need for b12, b12 keeps your CNS functioning properly and you can get extremely ill without it. It is only found in animal sources such as meat, milk and eggs. there is also ONE brand of nutritional yeast that provides b12, because it is added. not naturally occurring. the same goes for vegan milks and mock meats fortified with b12. there are also vegan b12 supplements. but again, that's not a natural source of b12. a lot of companies are also using genetically engineered bacteria in the b12 supplements, which is a major issue in my opinion.
according to Dr. McDougall, nori is a source of active b12, but i guess it can vary based on the conditions it has been exposed to and isn't considered reliable so you should have blood tests done if you're using it as your source of b12
and that is according to veg sources like Vegan Health, vrg.org, Raw Vegan Mama, etc.
updated by @justsomechick: 07/23/15 06:27:48PM