The vitamins are chemical compounds of organic nature. They are present in very small amounts in food and are necessary for life because they are important regulators of many compounds in our bodies. Milk, yogurt, fish. Sun baths are necessary.
Vitamin E Protects the red corpuscles.
There is the false believe that vitamins fatten and it is NOT that way, because they do not contain calories. If a good equilibrated and balanced diet is done it's NOT necessary to use vitamins. If there is some situation that sometimes makes a body equilibrium disorder, like a sickness, stress excess or exercise excess, vitamins could be benefic but remember that this compounds should be medical prescription and not by the media adds. If you have any doubt with respect to this information consult your family doctor.