White kidney bean extract is used as a natural, non-stimulant ingredient in nutritional and weight loss supplements. These products are referred to as carbohydrate or starch blockers. Bean functional components in white kidney bean extract pigment is a natural alpha amylase inhibitor.The key benefit of white kidney bean extract is that it delays digestion and absorption of carbohydrates by blocking an enzyme, alpha amylase, associated with carbohydrate digestion in the intestines.Native to Central and South America, they are well known for their texture and their ability to absorb flavors.