Organic Black Raisin along with most dehydrated fruits, are high in iron. One little box (about 1/3 cup) has almost 1 mg of iron — not bad for a mid-afternoon snack. Raisins are also high in potassium and an excellent source of B vitamins. The other health benefits of raisins include relief from constipation, acidosis, anaemia, fever, and relief from sexual dysfunction. Black Raisins have also been known to help in attempts to gain weight in a healthy way, as well as its positive impact on eye health, dental care, and bone quality. These dried grapes are super low in calories and are naturally sweet.