Guar gum is a fiber from the seed of the guar plant.
Guar gum is used as a laxative for treating constipation. It is also used for treating diarrhea, diarrhea due to cancer drugs, irritable bowel syndrome (IBS), weight loss, diabetes, a liver disorder in pregnancy (intrahepatic cholestasis of pregnancy), and anal fissures. It is also used for high cholesterol, high blood pressure, and a condition known as "small intestinal bacterial overgrowth." It is also used for preventing drops in blood pressure after a meal (postprandial hypotension).
In foods and beverages, guar gum is used as a thickening, stabilizing, suspending, and binding agent.
In manufacturing, guar gum is used as a binding agent in tablets, and as a thickening agent in lotions and creams.
How does it work?
Guar gum is a fiber that normalizes the moisture content of the stool, absorbing excess liquid in diarrhea, and softening the stool in constipation. It also might help decrease the amount of cholesterol and glucose that is absorbed in the stomach and intestines.
There is some interest in using guar gum for weight loss because it expands in the intestine, causing a sense of fullness. This may decrease appetite.