# Flageolet Bean (Phaseolus vulgaris)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/flageolet-bean
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Legume
**Also Known As:** Phaseolus vulgaris, White kidney bean, Cannellini bean, Navy bean, Common bean, French bean, Haricot bean

## Overview

Flageolet bean (Phaseolus vulgaris) extract contains alpha-amylase inhibitors that block carbohydrate [digestion](/ingredients/condition/gut-health) and absorption. Clinical studies demonstrate significant body fat reduction and weight management through reduced glucose uptake from starchy foods.

## Health Benefits

• Body fat reduction: High-quality RCT (n=90) showed 2.95 kg fat loss over 12 weeks with Phase 2 extract (PMID: 38830962)
• Weight management support: 45-day RCT with Phaseolean® demonstrated significant weight reduction versus placebo (CTRI/2023/02/049440)
• Carbohydrate absorption reduction: Alpha-amylase inhibition prevents starch breakdown, reducing calorie absorption from complex carbohydrates
• Blood sugar management: May support glycemic control through reduced postprandial glycemia via enzyme inhibition
• Appetite regulation: Potentially suppresses ghrelin secretion, though evidence is preliminary

## Mechanism of Action

Flageolet bean's alpha-amylase inhibitors, primarily phaseolamin, competitively bind to pancreatic alpha-amylase enzymes in the small intestine. This binding prevents the breakdown of complex carbohydrates into simple sugars, reducing glucose absorption and subsequent insulin response. The reduced caloric absorption from starches promotes lipolysis and [fat oxidation](/ingredients/condition/weight-management) pathways.

## Clinical Summary

A high-quality RCT with 90 participants demonstrated 2.95 kg body fat loss over 12 weeks using Phase 2 flageolet bean extract (PMID: 38830962). A separate 45-day RCT with Phaseolean® showed significant weight reduction compared to placebo (CTRI/2023/02/049440). These controlled trials provide moderate evidence for weight management benefits, though longer-term studies are needed. The evidence is strongest for carbohydrate absorption inhibition and short-term weight loss outcomes.

## Nutritional Profile

Flageolet beans (Phaseolus vulgaris) provide approximately 21-23g protein per 100g dry weight, with a moderate essential amino acid profile rich in lysine (~7.2g/100g protein) but limiting in methionine and cysteine (~2.1g/100g protein combined), typical of legumes. Carbohydrates comprise ~60-62g per 100g dry weight, predominantly complex starches (resistant starch ~4-6g/100g) and oligosaccharides (raffinose, stachyose ~3-5g/100g). Total dietary fiber ranges 15-18g per 100g dry weight, split roughly 70% insoluble (cellulose, hemicellulose) and 30% soluble (pectin) fractions. Fat content is low at 1.0-1.5g per 100g dry weight, predominantly polyunsaturated fatty acids. Key micronutrients per 100g dry weight include folate (~394 µg, ~99% DV), iron (~6.9 mg, ~38% DV, non-heme with bioavailability ~5-8% due to phytate inhibition), potassium (~1070 mg), magnesium (~138 mg), phosphorus (~407 mg), zinc (~2.8 mg, bioavailability reduced by ~25-35% due to phytic acid at ~6-10 mg/g), and manganese (~1.0 mg). Bioactive compounds include alpha-amylase inhibitor protein (Phase 2/Phaseolamin, concentrated in seed coat, active fraction ~0.5-2% of total protein by dry weight), phytic acid (1.0-1.5g/100g, acts as antinutrient reducing mineral bioavailability), polyphenols including condensed tannins (~2-4 mg catechin equivalents/g) and flavonoids (kaempferol, quercetin glycosides), and lectins (phytohemagglutinin, largely denatured upon thorough cooking). Bioavailability notes: soaking (8-12 hours) reduces phytic acid by ~30-40% and lectins significantly; pressure cooking reduces antinutrient load more effectively than boiling; protein digestibility-corrected amino acid score (PDCAAS) approximately 0.68-0.75 for cooked beans. The alpha-amylase inhibitory protein responsible for documented carbohydrate absorption reduction is heat-sensitive at temperatures above 80°C for extended periods, meaning raw or minimally processed preparations retain highest inhibitory activity.

## Dosage & Preparation

Clinically studied standardized extracts (Phase 2, Phaseolean®) range from 700-1000 mg three times daily (2100-3000 mg/day) taken before carbohydrate-rich meals. Lower doses of 1000 mg twice daily (2000 mg/day) showed weight loss trends. Only proprietary aqueous extracts standardized for alpha-amylase inhibition (e.g., 20,000 units/g) have been studied. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Flageolet bean extract is generally well-tolerated with mild gastrointestinal effects like bloating or flatulence being most common. It may interact with diabetes medications by enhancing blood sugar-lowering effects, requiring glucose monitoring adjustments. Individuals with kidney disease should use caution due to potential effects on mineral absorption. Pregnancy and breastfeeding safety data is insufficient, so avoidance is recommended during these periods.

## Scientific Research

A 12-week double-blind RCT (n=90) using Phase 2 white kidney bean extract showed significant body fat reduction of 2.95 kg versus placebo (PMID: 38830962). Additional trials including a 45-day study with Phaseolean® (CTRI/2023/02/049440) and meta-analyses (PMID: 29677119) confirm fat reduction benefits, though weight loss effects remain inconsistent across studies.

## Historical & Cultural Context

No historical or traditional medicinal uses were identified in the available research. Current applications focus exclusively on modern nutraceutical uses for weight management and glycemic control developed through contemporary scientific investigation.

## Synergistic Combinations

Green tea extract, chromium picolinate, garcinia cambogia, glucomannan fiber, berberine

## Frequently Asked Questions

### How much flageolet bean extract should I take for weight loss?

Clinical studies used 445-500mg of standardized flageolet bean extract (Phase 2 or Phaseolean®) taken 15-30 minutes before carbohydrate-rich meals. The effective dosing was typically twice daily with main meals containing starches.

### How long does flageolet bean extract take to show weight loss results?

Significant fat loss of 2.95kg was observed after 12 weeks in clinical trials. Some participants may notice reduced post-meal glucose spikes within days, but meaningful weight changes typically require 6-8 weeks of consistent use.

### Can flageolet bean extract cause digestive problems?

Yes, flageolet bean extract commonly causes mild digestive issues like bloating, gas, and loose stools, especially when first starting. These effects usually diminish after 1-2 weeks as the digestive system adapts to increased undigested carbohydrates reaching the colon.

### Does flageolet bean extract work if I eat low-carb foods?

No, flageolet bean extract primarily works by blocking starch digestion from foods like bread, pasta, rice, and potatoes. It has minimal effect on protein, fats, or simple sugars, so benefits are reduced on very low-carbohydrate diets.

### Is flageolet bean extract safe with diabetes medications?

Flageolet bean extract can enhance the glucose-lowering effects of diabetes medications like metformin or insulin, potentially causing hypoglycemia. Diabetics should monitor blood sugar closely and consult their healthcare provider before combining these treatments.

### What is the difference between flageolet bean extract and whole flageolet beans for carbohydrate management?

Flageolet bean extract, particularly Phase 2 type products, contains concentrated alpha-amylase inhibitors that can block up to 25-30% of starch digestion, whereas whole cooked beans provide fiber and nutrients but lack this concentrated enzymatic inhibition. Clinical studies demonstrating significant carbohydrate absorption reduction (PMID: 38830962) specifically used standardized extracts rather than whole beans. For maximum carbohydrate-blocking effect, extracts taken before meals are more efficient than consuming whole beans, though whole beans offer additional nutritional benefits like resistant starch and minerals.

### Can flageolet bean extract be safely combined with blood sugar medications like metformin?

Flageolet bean extract's mechanism of reducing carbohydrate absorption may have additive effects with blood sugar-lowering medications, potentially increasing hypoglycemia risk if dosing is not adjusted. While the ingredient itself has no known direct chemical interactions with metformin or other diabetes drugs, the combined effect of reduced glucose absorption plus medication requires medical supervision. Patients taking diabetes medications should consult their healthcare provider before adding flageolet bean extract and may need glucose monitoring adjustments.

### Is flageolet bean extract suitable for people following high-protein or ketogenic diets?

Flageolet bean extract works specifically on starch and complex carbohydrate absorption through alpha-amylase inhibition, making it less relevant for ketogenic or very low-carb diets where carbohydrate intake is already minimized. The 2.95 kg fat loss demonstrated in clinical trials (PMID: 38830962) occurred in subjects consuming a standard diet with adequate carbohydrates; effects in ketogenic contexts have not been studied. For high-protein dieters consuming moderate carbohydrates, the extract may provide modest additional carbohydrate reduction benefits.

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