Guggulsterones Guggul Extract, 120 Tablets, Source NaturalsGuggulsterones Supports Cholesterol Wellness. Guggulsterones help maintain cholesterol levels already in the normal range, by acting at the farnesoid X receptor (FXR) to promote the conversion of cholesterol into bile. They also boost thyroid activity, which supports cholesterol regulation by the liver. Supplement Facts Serving Size: 1 Tablet Amount %DV Guggul Extract (10%) 375 mg Yielding 37. 5 mg Guggulsterones Other Ingredients: microcrystalline