All vitamins have very specific functions on the body and must be contained in the diet to prevent deficiencies. There is no magic food that contains all the vitamins, only the right combination of food groups cover the requirements.
But you do not have a feed that covers all the essential nutrients (proteins, carbohydrates, fats, vitamins and minerals) for life, no vitamin by itself will solve the problem of malnutrition, either growth or the infections.
Vitamins are just as important as protein, minerals, carbohydrates, fats and water. All these nutrients play an important role in the body properly functioning and must be present in the diet to prevent deficiencies, malnutrition and dehydration in the case of water.
Human beings by their nature tend to believe that if something happens in our bodies is the absence of an element, and such is the promotion or marketing of vitamins, which leads to an easy solution, so far as to go to the pharmacy , store or “specialized” in food supplements and vitamin and mineral closest to locate the multivitamin (medicine) that contains the vitamins in our view we need.
