Raisins are dried grapes. This drying process concentrates both the nutrients and sugars present in grapes, making raisins nutrient and calorie-dense. Raisins are a good source of soluble fiber, which aids our digestion. It is also a great source of vitamin A, which is essential for skin health at all levels. Antioxidants such as vitamin A protect the top layer of the skin from sun damage and also hydrate the skin from within.