Hazelnuts are also known as Filberts or Cob nuts depending on their country of origin. They contain a high proportion of essential oils and supply a well-balanced mixture of vitamins and minerals. Hazelnuts contain a high concentration of vitamin E which prevents oxidation of the polyunsaturated fats, and it is also one of the few nuts which contain vitamin A, which is a natural antioxidant  The B-group vitamins are also well represented in hazelnuts, particularly vitamin B5 and B6. Moreover, hazelnuts are an excellent source of minerals, particularly the minerals manganese, selenium and zinc, but the protein composition is such that combinations with other nuts, grains or legumes are required in order to obtain the maximum benefit.