Blueberries have a well-known quality for improving vision. Blueberries is an excellent way to maintain skin, hair and nails. Also, to improve coordination, and renew cellular bodies. Because blueberries are rich in iron, they help to fight anemia. The Vitamin C and E work as anti-oxidants, neutralizing free radicals. The biologically active substance niomirtilin, which lowers blood glucose, makes these berries recommended for people with diabetes.