Green coffee bean extract is often marketed as a weight loss supplement, although studies show that it may be beneficial in a number of health promoting ways.
The extract comes from green coffee beans, i.e. unroasted ones, which are rich in caffeine and in chlorogenic acid.
Studies suggest that chlorogenic acid can reduce the absorption of carbohydrates, thereby helping to reduce blood sugar. It also appears to boost the production of adiponectin, a fat burning hormone, and to reduce the amount of fat stored by the liver.
Chlorogenic acid is also an antioxidant, which helps to prevent cellular damage caused by free radicals. There is some evidence that it may help to reduce cholesterol levels too.
Meanwhile, the caffeine in green coffee bean extract acts as a stimulant to boost metabolism, and provides increased energy and a greater attention span too. It is thought that caffeine may have an ongoing neuroprotective effect, although more research in this area is needed.
As a supplement, green coffee bean extract is normally available as a tablet or capsule. Taken to excess, it has a laxative effect.