White Kidney Bean Extract (Phase 2)

Also known as: Phaseolus vulgaris extract · Phase 2 carb controller · Starch blocker

●●○Moderate Evidence

Inhibits amylase — the enzyme that breaks down dietary starch. Reduces carbohydrate digestion and caloric absorption from starchy meals. Most evidence is with the Phase 2 trademarked extract.

Effective Dose

500–1500mg / 15 min before high-carb meals

per clinical evidence

Evidence Level

Moderate

Weight Management

Mechanism

Alpha-amylase inhibition — reduces starch digestion and glucose absorption

primary action

Best For

Carbohydrate blocking

Blood sugar, Weight management

This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.

What Is White Kidney Bean Extract (Phase 2)?

White kidney bean extract contains phaseolamin — a glycoprotein that inhibits salivary and pancreatic alpha-amylase, reducing the breakdown of complex carbohydrates (starches) into absorbable sugars. Undigested starch reaches the colon and acts as a prebiotic fibre.

How It Works: The Science

Alpha-amylase cleaves alpha-1,4-glycosidic bonds in starch, converting it to maltose and glucose oligomers for further digestion. Phaseolamin competitively inhibits this enzyme, leaving starch partially or fully undigested. This reduces the postprandial glucose spike from starchy meals and delivers starch to the colon for fermentation.

Primary Mechanism

Alpha-amylase inhibition — reduces starch digestion and glucose absorption

Evidence-Based Benefits

Reduces starch absorption and postprandial glucose

moderate

Udani et al. (2004) — Phase 2 extract significantly reduced carbohydrate absorption

Promotes modest fat loss in combination with a diet

moderate

Celleno et al. (2007) — significant fat loss vs placebo when taken before starchy meals

Dosage Guide

Effective Dose

500–1500mg / 15 min before high-carb meals

500–1500mg, 15–30 minutes before high-starch meals (pasta, rice, bread, potato). Ineffective against sugars and fat. Best used situationally before unavoidable high-carb meals rather than continuously.

Safety Profile & Side Effects

GI symptoms (bloating, flatulence, diarrhoea) from undigested starch fermentation in the colon — start with a low dose. Generally safe.

Who Should (and Shouldn't) Take It

Best for

Carbohydrate blockingBlood sugarWeight management

Who it's for

Those managing carbohydrate intake who frequently encounter unavoidable high-starch meals. Useful for blood sugar management and weight control when dietary compliance is difficult.

Frequently Asked Questions

What is the recommended dose of White Kidney Bean Extract (Phase 2)?

Is White Kidney Bean Extract (Phase 2) safe?

GI symptoms (bloating, flatulence, diarrhoea) from undigested starch fermentation in the colon — start with a low dose. Generally safe.

How does White Kidney Bean Extract (Phase 2) work?

Who should take White Kidney Bean Extract (Phase 2)?

Those managing carbohydrate intake who frequently encounter unavoidable high-starch meals. Useful for blood sugar management and weight control when dietary compliance is difficult.

Related Ingredients

Glucomannan (Konjac Fibre)Berberine Cinnamon Extract (Ceylon / Cassia)

Medical Disclaimer

Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →