Sunflower seeds contain almost every vitamin and substantial amounts of key minerals, including magnesium, iron, copper, and zinc. In addition, the protein content of sunflower seeds is high, and they can serve as a meat substitute. The confectionery variety is considered to be one of the healthiest snack foods available. The majority of the oilseed variety of sunflower seed are crushed after the hull is removed. The oil is used for frying or to produce salad dressings, shortening, and margarine. The meal is used as a protein supplement in livestock feed as it usually contains about 35 percent protein.