Benefits An antioxidant made by the body, Alpha Lipoic Acid also helps break down food into the energy needed by your cells. It helps the body recycle and renew vitamins C and E, making them serviceable again. And unlike many antioxidants, which dissolve only in fat or only in water, ALA fights free radicals in both the fatty and watery parts of cells, protecting both from free radical damage. "Lipoic acid can zip in and out of any cell in the body, even those in the brain," says Lester Packer, Ph.D., professor of molecular and cell biology at the University of California, Berkeley.

How it delays aging: Clinical studies suggest that Alpha Lipoic Acid may help prevent the nerve damage, caused by free radical attacks, that frequently accompanies diabetes. In one German study, intravenous Alpha Lipoic Acid significantly reduced pain, tingling, and numbness in the feet of people with diabetes. What you'll find. ALA comes in capsules and tablets, in dosages from 50 to 300 milligrams.

How much to take: The general recommended dose is 50 to 100 milligrams a day. In the treatment of diabetes, the recommended dosage is 300 to 600 milligrams a day, says Dr. Packer.

Side Effects: If you have diabetes and are being treated for symptoms of nerve damage, Dr. Packer suggests that you talk to your doctor before taking Alpha Lipoic Acid supplements.Overdosage cause nausea and upset stomachs, and excessive doses can even lead to low blood sugar.