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White Kidney Bean Extract – Starch Blocker: A Guide to Uses and Scientific Evidence

What is White Kidney Bean Extract?

White Kidney Bean Extract is derived from the seeds of the white kidney bean plant (Phaseolus vulgaris). It contains a natural substance called phaseolamin, which is believed to inhibit the activity of the enzyme alpha-amylase, involved in the digestion of starches.

Uses of White Kidney Bean Extract

White Kidney Bean Extract is commonly used as a dietary supplement for its potential to “block” the digestion and absorption of starches in the body. This mechanism is thought to aid in weight management and promote healthy blood sugar levels.

Scientific Support for White Kidney Bean Extract Use

Research suggests that White Kidney Bean Extract may help reduce the digestion and absorption of starches by inhibiting the activity of alpha-amylase[1]. By doing so, it may decrease the number of calories absorbed from starchy foods, potentially leading to weight loss or weight maintenance. Additionally, some studies have indicated that White Kidney Bean Extract may help improve glycemic control by reducing postprandial blood sugar levels[2].

The hypothesized mechanism of action involves phaseolamin binding to alpha-amylase, preventing it from breaking down complex carbohydrates into simple sugars that can be absorbed by the body. This results in a portion of the starch passing through the digestive system undigested and unabsorbed, thereby reducing caloric intake and impacting blood sugar levels.

Health Concerns

While White Kidney Bean Extract is generally considered safe for most people when taken at recommended dosages, some individuals may experience mild gastrointestinal discomfort such as gas, bloating, or diarrhea. Additionally, individuals with kidney disease, pregnant or breastfeeding women, and those taking medications should consult with a healthcare professional before using White Kidney Bean Extract.

Recommended Standardization or Dosage

White Kidney Bean Extract supplements should be standardized to contain a specific concentration of phaseolamin, typically ranging from 1,000 to 1,500 alpha-amylase inhibiting units (AAIU) per serving. As for dosage, the recommended amount varies depending on the specific product and individual factors such as age, weight, and health status. However, typical dosages range from 500 to 1,500 mg per day, taken with meals containing starch.


  1. Celleno L, Tolaini MV, D’Amore A, et al. A Dietary supplement containing standardized Phaseolus vulgaris extract influences body composition of overweight men and women. *International Journal of Medical Sciences*. 2007;4(1):45-52. doi:10.7150/ijms.4.45
  2. Barrett ML, Udani JK. A proprietary alpha-amylase inhibitor from white bean (Phaseolus vulgaris): a review of clinical studies on weight loss and glycemic control. *Nutrition Journal*. 2011;10(1):24. doi:10.1186/1475-2891-10-24
  3. Udani JK, Singh BB. Blocking carbohydrate absorption and weight loss: a clinical trial using Phase 2 brand proprietary fractionated white bean extract. *Alternative Therapies in Health and Medicine*. 2007;13(4):32-37.


White Kidney Bean Extract offers a potential dietary supplement option for individuals looking to manage weight or support healthy blood sugar levels. Research suggests that its primary mechanism of action involves inhibiting the activity of alpha-amylase, reducing the digestion and absorption of starches in the body. While generally safe, individuals should be aware of potential gastrointestinal side effects and consult with a healthcare professional before use, particularly if they have underlying health conditions or are taking medications.

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