A double-blind study of daily administration of sublingual Vitamin B12 tablets manufactured by Solgar (each tablet containing 1000 mcg. of Vitamin B12, mannitol, stearic acid, Magnesium stearat , natural cherry flavor; weight of each tablet is 100 mcg.) opposed to placebo tablets (containing the same ingredients, except the Vitamin B12). The two types of tablets will be the same shape, size, color and have the same flavor. The tablets will be purchased from the Solgar Company in identical boxes, 30 tablets per box. The boxes will be numbered (1 or 2) - according to the type of treatment. The patient will receive instructions about daily treatment for a period of six (6) months, one tablet before going to sleep).