Vitamin B-12 and all other B Vitamins plays a vital role in generating certain brain chemicals which influence all our mood factors and brain functions. Less consumption of Vitamin B-12 may lead to depression. The low level of Vitamins occurs due to a bad diet. The best method to get Vitamin B-12 is to include the foods in our diet which contains all the important nutrients which our body needs. It is rich in various foods like fish, eggs, meat, all cereals which gives strength to our body.