It is found inside every cell of the body, where it helps generate the energy that keeps us alive and functioning. Lipoic acid is an antioxidant, which means it neutralizes naturally occurring, but harmful, chemicals known as free radicals. Unlike other antioxidants, which work only in water or fatty tissues, lipoic acid is unusual in that it functions in both water and fat. By comparison, vitamin E works only in fat and vitamin C works only in water. This gives lipoic acid an unusually broad spectrum of action.
Antioxidants are a bit like kamikaze pilots, sacrificing themselves to knock out free radicals.
One of the more interesting findings about lipoic acid is that it may help regenerate other antioxidants that have been used up. Some research also suggests that lipoic acid may do the work of other antioxidants in which the body is deficient. Thanks to its fat solubility, lipoic acid can get inside nerve cells, where it helps prevent free radical damage. Studies performed in Germany have shown success with lipoic acid in treating diabetic neuropathy, a condition in which nerve damage causes pain and numbness in the hands and feet. Sources Because a healthy body makes enough lipoic acid to supply its energy requirements, there is no daily requirement for this supplement.