excellent source of dietary fibre, vitamin c for immune support, perfect breakfast snack smoothie option, nature's best sport offers a world class range of premium uk made supplements.cranberries provide a value source of vitamin c which is required for a healthy immune system in addition to playing a key role in connective tissue health. vitamin c is also useful for reducing the free radical damage associated with exercise. dried cranberries provides a useful source of dietary fibre. ¼ cup provides Approx. 3 g of fibre.