GCE is present in green or raw coffee and best found in its raw state in the Green coffee bean. It is also present in roasted coffee, but much of the GCE is destroyed during the roasting process. Some GCE constituents, such as chlorogenic acid (CGA) can also be found in a variety of fruits and vegetables. The daily intake of CGA in persons drinking coffee varies from 0.5 to 1g. The traditional method of extraction of GCE from green coffee bean, Coffea canephora robusta, involves the use of alcohol as a solvent. Extracted GCE is marketed as a weight loss supplement under a variety of brand names as a weight loss supplement such as “Coffee Slender”, and “Svetol”.
Evidence is accumulating from animal studies regarding the use of GCE as a weight loss supplement. Consumption of coffee has also been shown to produce changes in several glycaemic markers in older adults. Similarly, other research has indicated that the consumption of caffeinated coffee can lead to some reductions in long-term weight gain, an effect which is likely to be due to the known thermogenic effects of caffeine intake as well as effects of GCE and other pharmacologically active substances present in coffee. GCE has also been postulated to modify hormone secretion and glucose tolerance in humans. This effect is accomplished by facilitating the absorption of glucose from the distal, rather than the proximal part of the gastrointestinal tract.
So in general, GCE is an effective weight loss supplement according to recent studies and is recommended.
Related article: natural healthy dieting