Mixed nuts. Trays of assorted nuts. These are walnuts (top right tray, also contains hazelnuts and almonds), brazil nuts (upper left), pecans (upper centre), almonds (centre left), hazelnuts (centre right), and cashew nuts, hazelnuts and pine nuts from left to right in the bottom tray. Nuts are an excellent source of vitamin E and some of the B-complex vitamins, and also contain protein and a variety of essential minerals. Some people have a hypersensitivity to nuts which manifests as an extreme allergic reaction. Even a brush of nut across the skin can provoke the response.