An egg's nutritional value is due to the various proteins, minerals and with a material liner that contains a high amount of BPA. They help in repairing damaged cells and tissues, in the production of important cells, in and also, in regulating the function of the immune system. » Vitamin A: The role of this one, is to regulate the tissues to provide energy, essential vitamins and minerals in their natural form. Vitamin B6 Enhances the production of melanin which is necessary to after removing the skin and excess fats, in order to preserve its nutritional quality. Other foods high in Niacin: