Guar gum is a white flour-like fiber derived from the endosperm of the guar bean. It is most commonly used as a thickening agent and binder in many shelf products such as salad dressings, baked goods, and dairy products. Guar gum is economical because it has almost 8 times the water-thickening potency of cornstarch. 

Due to its water absorbency and gelling properties, it is also used as a fibrous laxative. However, guar gum can expand so greatly that it can clog the throat and intestines, causing digestive issues such as gas, abdominal pain, and preventing absorption of vital nutrients and minerals.