Herbal Extract
White Kidney Bean Extract (Phaseolus vulgaris)
Also known as: Phaseolus vulgaris extract, Kidney bean extract, Phase 2, Carb blocker
White kidney bean extract contains alpha-amylase inhibitors that may reduce carbohydrate digestion and absorption. Research shows modest effects on postprandial blood glucose and weight management, though clinical significance remains limited.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Primary uses
- Carbohydrate digestion reduction
- Postprandial glucose management
- Weight management support
- Blood sugar support
How it works
- Alpha-amylase inhibition reduces starch breakdown
- Delays carbohydrate absorption in small intestine
- May reduce postprandial glucose spikes
Dosage
- Typical range
- 500–3,000 mg daily, typically 1,500–2,000 mg
- Timing
- With main meals containing carbohydrates
- With food
- Must be taken with food containing carbohydrates to be effective
- Duration
- Typically used daily for 8–12 weeks in clinical trials; can be used long-term
- Special populations
- Generally safe in adults; limited data in pregnancy/lactation and pediatric populations
Forms
- Powder· 70/100
- Capsule· 70/100
- Tablet· 70/100
Safety
Common side effects
- Bloating
- Flatulence
- Abdominal discomfort
- Constipation
Contraindications
- Inflammatory bowel disease (may exacerbate symptoms)
- Severe gastrointestinal conditions
Evidence notes
Multiple RCTs show modest benefits for glucose control and modest weight loss (~2-3 lbs over 8-12 weeks), but effect sizes are small and heterogeneous. Some studies funded by ingredient suppliers. Not suitable for A-B grade due to modest clinical magnitude and variable study quality.
Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.
Related in Herbal Extract
Check a full stack
Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.
Open the checkerWhere does White Kidney Bean Extract (Phaseolus vulgaris) fit in your stack?
Answer two questions and get a stack graded on research — every ingredient scored on the evidence behind it, not the marketing.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.