Mango is very low in saturated fat, cholesterol, and sodium and an excellent source of dietary fiber and vitamin B6, A, C, potassium, magnesium, and copper. It boosts the immune system. Storage tips: Keep unripe mangoes at room temperature out of direct sunlight. Store mature mangoes in the refrigerator, where they retain quality for about five days, and keep cut mangoes in an airtight container in the fridge.