There are many indications in the literature that Non-Anaemic deficiency of B12 is associated with bipolar. How many people having bipolar are vegetarians? B12 (Cobalamin) is associated with the insulation of the nervous. If the insulation of the nervous is deficient (same as elect wires) we get short circuit or nervous breakdown or supper sensitive. B12 is depleted when under stess. B12 repair is slow it don\'t exist in vegetarian diet. google \'cobalamin\'