As noted in many lipozene reviews out there, the main ingredient of Lipozene is glucomannan, which is taken from the konjac plant and is essentially a plant fiber that suppresses appetite by making the stomach believe it's full (which is something that's present in all fiber-enriched foods). The fiber prolongs that full feeling by slowing down the emptying of a stomach full of food and affecting your blood sugar. 

In fairness to the Lipozene manufacturers, there are studies out there that allege glucomannan is useful in helping prevent obesity thanks to its appetite-suppressing capabilities. The validity of these claims is still subject to further testing though. Other Lipozene ingredients include Vitamin B12, Vitamin B6, kola nut, and green tea, which are all common weight-reduction ingredients. The bottom line here is that Lipozene is less of a fat-burning diet pill and more of a fiber supplement that aids in digestion and may or may not reduce your cholesterol levels.