However, a small percent find blood sugar control difficult unless they also restrict carbohydrates, especially those with high glycemic index. Often low in diabetics, most studies show an improvement in blood sugar control with taking vitamin C supplements. Extra vitamin C can affect the results of urine tests for glucose. It does not alter the blood tests. It helps protect the nerves, glands, joints and connective tissues from oxidation and it aids in the absorption of iron.
Some research indicates it strengthens the immune system.
At 400 IU daily, Vitamin E reduces oxidation stress and decreases the stickiness of blood. At 900 IU, vitamin E has been shown to improve the body's ability to use glucose and might reduce insulin requirements. Vitamin E may be useful in prevention and treatment of atherosclerosis and diabetic vascular disease. This antioxidant helps the heart to function and promotes the use of fatty acids. B6 is often low in diabetics, especially among those who have nerve damage.