white Kidney Bean Extract contains phaseolin, which used to lose weight.  It is yellow brown to off white powder from seed of Phaseolus Vulgaris linn.

White Kidney Bean extract is used as a natural, non-stimulant ingredient in nutritional and weight loss supplements, which are referred to as starch blockers. The extract consists of a compound, Phaseolin and phaseolamin, which may aid weight loss by inhibiting the body's production of alpha-amylase, an enzyme involved in the digestion of carbohydrates.