5. Vitamin B12
Vitamin B12, also called cyanocobalamin, plays a key role in the normal functioning of the brain and nervous system, and for the formation of blood, as well as for good metabolism. Sources of this vitamin include milk, yogurt, cheese, eggs, meat and fish. If you are a vegetarian, you are at a higher risk of deficiency of this vitamin. Therefore, you need to take daily vitamin B12 supplementation.