Nicotinamide or vitamin B3: It helps in maintaining healthy skin and nerves , Folic acid or vitamin B9 is essential for the formation of red blood cells. It is also required for the formation of DNA and other genetic material. , Vitamin B12 is essential for the functioning of the brain and nerves, for the production of red blood cells and for DNA synthesis. It also plays a major role in protein and fat metabolism, fertility and the functioning of various hormones.