# Winged Beans (Psophocarpus tetragonolobus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/winged-beans
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Legume
**Also Known As:** four-angled bean, dragon bean, asparagus pea, Manila bean, Goa bean, princess bean, four-cornered bean, winged pea, tetragon bean, kacang botol, sigarilyas, dau rong

## Overview

Winged beans (Psophocarpus tetragonolobus) are a tropical legume rich in polyphenols, flavonoids, and tocopherols that exhibit [antioxidant](/ingredients/condition/antioxidant) and anti-inflammatory activity. Their bioactive compounds appear to induce apoptosis in cancer cell lines and suppress [pro-inflammatory cytokine](/ingredients/condition/inflammation)s via NF-κB pathway modulation.

## Health Benefits

• May support cellular health through apoptosis induction in colorectal cancer cells (preliminary in vitro evidence, IC50=117.86 µg/mL)
• Potentially reduces [inflammatory](/ingredients/condition/inflammation) markers including IL-1β, IL-6, and TNF-α (in vitro study only)
• Contains high concentrations of natural [antioxidant](/ingredients/condition/antioxidant)s and polyphenols (HPLC-verified, no human trials)
• Root-tuber trypsin inhibitor shows anticancer effects on osteosarcoma cells (preliminary in vitro evidence at 5 µg/mL)
• Traditional food source providing comprehensive nutrition from pods, seeds, leaves, and tubers (centuries of dietary use, no clinical validation)

## Mechanism of Action

Polyphenolic extracts from winged beans inhibit colorectal cancer cell proliferation with an IC50 of 117.86 µg/mL, likely by activating caspase-mediated apoptotic pathways and downregulating anti-apoptotic Bcl-2 proteins. Their flavonoids and phenolic acids suppress NF-κB signaling, reducing transcription of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s IL-1β, IL-6, and TNF-α. Additionally, gamma- and delta-tocopherol isomers present in the seeds scavenge [reactive oxygen species](/ingredients/condition/antioxidant) by donating hydrogen atoms to lipid peroxyl radicals, protecting cellular membranes from oxidative damage.

## Clinical Summary

Current evidence for winged bean bioactivity is limited predominantly to in vitro cell culture studies, with no large-scale human clinical trials published to date. The anticancer activity showing an IC50 of 117.86 µg/mL was demonstrated in colorectal cancer cell lines, and [anti-inflammatory](/ingredients/condition/inflammation) cytokine suppression of IL-1β, IL-6, and TNF-α has been observed only in cell-based assays. A small number of animal studies support [antioxidant](/ingredients/condition/antioxidant) and lipid-lowering properties, but translating these concentrations to effective human doses remains unestablished. Consumers should treat all health claims as preliminary until controlled human trials confirm efficacy.

## Nutritional Profile

Winged beans (Psophocarpus tetragonolobus) are exceptionally nutrient-dense across all plant parts (leaves, pods, seeds, flowers, tuberous roots), making them nutritionally unique among legumes. Per 100g of mature dried seeds: Protein: 29–37g (comparable to soybean; contains all essential amino acids including lysine ~6.5g/16gN and methionine, though methionine is the limiting amino acid at ~1.0g/16gN). Total fat: 15–18g (notably high for a legume), with fatty acid profile dominated by linoleic acid (omega-6, ~40% of total fat), oleic acid (~27%), palmitic acid (~14%), and alpha-linolenic acid (omega-3, ~2–3%). Total carbohydrates: 28–35g. Dietary fiber: 14–20g (mix of soluble and insoluble fractions supporting gut health). Moisture in fresh green pods: ~90g/100g. Per 100g fresh green pods: Protein: 2.9–4.5g; Fat: 0.4–0.6g; Carbohydrates: 4.6–7.8g; Fiber: 2.0–4.9g; Energy: ~49 kcal. Vitamins (mature seeds): Vitamin E (tocopherols): 80–160 mg/100g — one of the highest recorded in any legume, predominantly alpha-tocopherol (~110 mg/100g) with gamma-tocopherol also present (HPLC-verified); Vitamin A precursors (beta-carotene): ~0.04 mg/100g in seeds, significantly higher in leaves (~2.4 mg/100g); Vitamin C: ~18–22 mg/100g in fresh pods, negligible in dried seeds; B-vitamins: Thiamine (B1) ~0.40 mg/100g, Riboflavin (B2) ~0.24 mg/100g, Niacin (B3) ~2.0–2.8 mg/100g, Folate ~67–110 µg/100g in seeds. Minerals (dried seeds): Calcium: 440–490 mg/100g; Phosphorus: 370–440 mg/100g; Iron: 9–13 mg/100g; Magnesium: 170–200 mg/100g; Zinc: 3.5–4.5 mg/100g; Potassium: 870–1100 mg/100g; Manganese: ~2.5 mg/100g; Copper: ~1.2 mg/100g. Bioactive compounds: Total polyphenols: 8.5–18.6 mg GAE/g dry weight (HPLC-verified); Flavonoids including quercetin, kaempferol, and myricetin glycosides identified via HPLC-MS; Tannins (condensed): ~1.2–3.8 mg/g (antinutritional at high levels); Saponins: present in seeds (~0.4–1.0% dry weight). Tuberous roots: Protein: 9–14g/100g dry weight (unusually high for a root vegetable); starch: ~65g/100g dry weight; contain unique trypsin inhibitors with documented anticancer properties in vitro. Antinutritional factors (relevant to bioavailability): Phytic acid (phytate): 4.5–9.6 mg/g — significantly reduces mineral (Fe, Zn, Ca) bioavailability; estimated iron bioavailability from winged beans is low (~3–5%) without processing intervention. Trypsin inhibitors: 8–22 TIU/mg protein in raw seeds — reduce protein digestibility; largely inactivated (>80%) by boiling for 15–20 minutes or autoclaving. Hemagglutinins (lectins): present in raw seeds; heat-labile. Oxalates: moderate (~0.2–0.4g/100g fresh weight in leaves) — may limit [calcium absorption](/ingredients/condition/bone-health). Bioavailability enhancement: Soaking (12–18h) reduces phytate by ~30–40%; germination reduces phytate by ~50% and increases vitamin C and B-vitamin content; fermentation (e.g., tempeh-style) substantially improves protein digestibility (PDCAAS estimated at 0.78–0.89 post-processing vs. ~0.55 raw) and reduces tannin load. Protein digestibility of cooked seeds: ~75–82% (lower than soybean at ~91% due to residual antinutritional factors). Leaves (per 100g fresh): Protein ~5.5g; Beta-carotene ~2.4 mg; Vitamin C ~28 mg; Iron ~4.1 mg — leaves are notably more nutrient-dense per calorie than pods.

## Dosage & Preparation

No clinically studied human dosages exist. In vitro studies used ethanolic pod extract at 10-300 µg/mL (IC50=117.86 µg/mL) and purified trypsin inhibitor at 5 µg/mL. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Winged beans are generally considered food-safe when cooked, as raw seeds contain trypsin inhibitors and lectins that can impair protein [digestion](/ingredients/condition/gut-health) and cause gastrointestinal distress if not heat-inactivated. Individuals on anticoagulant medications such as warfarin should exercise caution due to the presence of vitamin K-active tocopherol-related compounds that could influence clotting parameters. No formal contraindications have been established, but those with legume allergies, particularly to soy or peanuts, may experience cross-reactive hypersensitivity. Pregnant and breastfeeding women should limit intake to normal dietary amounts until safety at supplemental doses is studied.

## Scientific Research

No human clinical trials exist for winged bean. Available research consists of two in vitro studies: one (PMID: 41463421) demonstrating cytotoxic effects on HT-29 colorectal cancer cells, and another (PMID: 39702856) showing trypsin inhibitor activity against MG-63 osteosarcoma cells.

## Historical & Cultural Context

Winged bean has been consumed as a nutrient-rich food crop in Southeast Asian cuisine for centuries, with pods, seeds, tubers, and leaves used for nutrition rather than formalized medicinal purposes. No specific traditional medicine system applications are documented.

## Synergistic Combinations

Green tea extract, Turmeric, Quercetin, Resveratrol, Black pepper extract

## Frequently Asked Questions

### What are the main bioactive compounds in winged beans?

Winged beans are particularly rich in polyphenols including flavonoids and phenolic acids, as well as tocopherols (vitamin E isomers), carotenoids, and proteins containing all essential amino acids. The seeds also contain trypsin inhibitors and lectins that require cooking to deactivate. These compounds collectively contribute to the antioxidant, anti-inflammatory, and potential anticancer properties observed in laboratory studies.

### Can winged beans help fight cancer?

Preliminary in vitro research shows that winged bean polyphenolic extracts inhibit colorectal cancer cell growth with an IC50 of 117.86 µg/mL, suggesting apoptosis-inducing activity at relatively modest concentrations. However, these findings come exclusively from cell culture experiments, and no human clinical trials have tested winged bean extracts against cancer. These results are considered hypothesis-generating only and should not be interpreted as a therapeutic claim.

### How do winged beans reduce inflammation?

Winged bean extracts have been shown in cell-based studies to lower levels of the pro-inflammatory cytokines IL-1β, IL-6, and TNF-α, likely through inhibition of the NF-κB signaling pathway. This pathway normally drives the transcription of inflammatory mediator genes, and polyphenols such as quercetin and kaempferol derivatives found in winged beans can block its activation. All current evidence is from in vitro models, so the magnitude of this effect in humans is unknown.

### Are winged beans a good source of protein?

Yes, winged bean seeds contain approximately 29–37% protein by dry weight, one of the highest protein contents among legumes, and their amino acid profile includes all essential amino acids including lysine and methionine. The leaves, flowers, and tuberous roots are also edible and contain significant protein. However, raw seeds must be cooked or processed to deactivate trypsin inhibitors that otherwise reduce protein digestibility and bioavailability.

### Are there any side effects or risks of eating winged beans?

Consuming properly cooked winged beans is considered safe for most people and carries risks comparable to other legumes, including mild bloating or flatulence due to fermentable oligosaccharides. Raw or undercooked seeds pose a more significant risk because active trypsin inhibitors and hemagglutinating lectins can cause nausea, vomiting, and impaired nutrient absorption. People with legume allergies and those taking blood-thinning medications should consult a healthcare provider before consuming winged bean supplements at doses beyond normal dietary levels.

### What is the current state of clinical research on winged beans for human health?

Most evidence for winged beans comes from in vitro (laboratory cell) studies rather than human trials, meaning results cannot yet be directly applied to dietary intake. While preliminary research shows promising effects on colorectal cancer cells and inflammatory markers, high-quality clinical studies in humans are needed to establish safety and efficacy. The existing data provides a foundation for further investigation but should not be considered conclusive proof of health benefits.

### Are winged beans safe to consume during pregnancy or while breastfeeding?

Limited safety data exists specifically for winged beans during pregnancy and lactation, so caution is advised. While winged beans are a whole food traditionally consumed in some cultures, the presence of trypsin inhibitors and other bioactive compounds warrants consultation with a healthcare provider before regular supplementation during these sensitive periods. Whole winged bean consumption in normal food amounts is likely safer than concentrated extracts.

### How does the bioavailability of winged bean polyphenols compare to other plant sources?

Winged beans contain polyphenols that have been verified through HPLC analysis, but human bioavailability data comparing them to other legumes or plant sources is lacking. The presence of trypsin inhibitors may affect nutrient absorption, potentially requiring cooking or processing to maximize availability of active compounds. Without human pharmacokinetic studies, it is difficult to assess whether winged beans are more or less bioavailable than alternative polyphenol sources.

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