Blackberries are tasty and nutrient dense fruit which stores a fine range of nourishing components. Vitamins provided by blackberries: A, B1, B2, B3, B6, C, E, K and folate. Mineral wealth of blackberries include calcium, iron, magnesium, phosphorous, potassium and zinc. Blackberries are also a good source of amino acids and essential dietary fiber without offering any harmful cholesterol.