White kidney bean extract powder(mainly contains α - amylase inhibitor, commonly known as "starch blocker"), because the impurities and most of starch were removed by using stratification technology during extraction, and the active white kidney bean protein hydrolysate powder was precipitated and protected by enzymatic hydrolysis technology (the retention activity is the a-amylase inhibitor). Therefore, the main effective component of this extract is active hydrolyzed protein powder (chemical) The name is α - amylase inhibitor, which is a glycoprotein with molecular weight of 56kda. It is reflected in the following table, namely protein. It has been proved that α - amylase inhibitor has a very strong ability to inhibit the conversion of amylase hydrolyzed starch into carbohydrates.