Guar gum is used as a gluten replacement in baked goods using flours such as rice, maize, potato, tapioca etc. These are the most common flours used by gluten intolerant people. Use to replace gluten in baked goods or as a stabiliser, thickener or emulsifyer.
The Wikipedia describes it as, also called guaran, a substance made from guar beans which has thickening and stabilising properties useful in various industries, traditionally the food industry, but increasingly the hydraulic fracturing industry. The guar seeds are dehusked, milled and screened to obtain the guar gum. It is typically produced as a free-flowing, off-white powder. It is classed as a galactomannan.
Ingredients: Guar gum (E412)