Use as herbal medicine
While it is still being studied, and the effects of the herb are not entirely known, the herb has been shown to reduce blood sugar levels when used for an extended period of time. Additionally, Gymnema alters the taste of sugar when it is placed in the mouth, thus some use it to fight sugar cravings. This effect, however, is short-lived, lasting a mere fifteen minutes. Some postulate that the herb actually reduces cravings for sugar by blocking sugar receptors in the tongue, but no scientific studies have supported this hypothesis. It is currently being used in an all natural medication for diabetes with other ingredients such as cinnamon, chromium, zinc, biotin, banaba, huckleberry and bitter melon.
The active ingredient is thought to be gurmenic acid which has structure similar to saccharose. Extracts of Gymnema is not only claimed to curb sweet tooths but also for treatment of as varied problems as hyperglycemia, overweightness, high cholesterol levels, anemia and digestion. According to the Sushruta of the Ayurveda it is helps to treat Madhumeha ie glycosuria.
This information was taken from wikipedia.org 20.05.2007