Glucomannan is a type of fiber found in the roots of the elephant yam, also called konjac.
How it works: Glucomannan absorbs water and becomes gel-like. It “sits” in your gut and promotes a feeling of fullness, helping you eat fewer calories (27).
Effectiveness: Three human studies showed that this fat burner supplement, combined with a healthy diet, can help people lose 8-10 pounds (3.6-4.5 kg) of weight in 5 weeks (28Trusted Source).
Other benefits: Glucomannan is a fiber that can feed the friendly bacteria in the intestine. It can also lower blood sugar, blood cholesterol and triglycerides, and is very effective against constipation (29Trusted Source, 30Trusted Source, 31Trusted Source).
Side effects: It can cause bloating, flatulence and soft stools, and can interfere with some oral medications if taken at the same time.
It is important to take this fat burner supplement about a half an hour before meals, with a glass of water. If you would like to try it, Amazon has a good selection available.
You can find an objective review of glucomannan in this article.
Bottom Line: Studies consistently show that the fiber glucomannan, when combined with a healthy diet, can help people lose weight. It also leads to improvements in various health markers.