Vitamin B12 is essential for a healthy nervous system, aiding in coordination and smooth muscle movement. As with other B vitamins, B12 plays a role in the production of red blood cells and conversion of food to usable energy. Unlike other B vitamins, B12 is not plentiful in foods. Special attention must be paid to ensure dietary B12 needs are met, particularly if the diet doesn't contain animal products and excercise level is moderate to high.
Best Thrive sources: chorella, miso, nurtitional yeast.

source: Thrive - Brendan Brazier [knizka]