vitamin and mineral content in fruits
Blackberries. An excellent source of vitamin C, blackberries have substantial amounts of fiber, iron, calcium, manganese, and potassium. Diets rich in potassium may help to maintain a healthy blood pressure. Berries are the highest source of antioxidants from fruits.n excellent source of vitamin C, blackberries have substantial amounts of fiber, iron, calcium, manganese, and potassium. Diets rich in potassium may help to maintain a healthy blood pressure.