# Winged Bean Seed (Psophocarpus tetragonolobus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/winged-bean-seed
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-25
**Evidence Score:** 2 / 10
**Category:** Seed
**Also Known As:** Psophocarpus tetragonolobus, Four-angled bean, Goa bean, Princess bean, Asparagus pea, Dragon bean, Kacang botol, Sigarilyas

## Overview

Winged bean seed (Psophocarpus tetragonolobus) contains bioactive peptides and phenolic compounds that exert ACE-inhibitory and antioxidant effects. Its protein-derived peptides inhibit angiotensin-converting enzyme to reduce [blood pressure](/ingredients/condition/heart-health), while flavonoids and tannins neutralize [free radical](/ingredients/condition/antioxidant)s through electron donation and metal chelation.

## Health Benefits

• [Blood pressure](/ingredients/condition/heart-health) reduction through ACE-inhibitory peptides (evidence: animal study only, PMID: 29469915)
• [Antioxidant activity](/ingredients/condition/antioxidant) with 65.0% DPPH radical scavenging and 65.7% metal chelation (evidence: in vitro only, PMID: 24658538)
• Potential anti-cancer properties showing cytotoxicity against colorectal cancer cells (evidence: in vitro only, IC50 = 117.86 µg/mL, PMID: 41463421)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects through suppression of IL-1β, IL-6, and TNF-α (evidence: in vitro only)
• High protein content (28-45%) supporting nutritional supplementation (evidence: compositional analysis)

## Mechanism of Action

Protein hydrolysates from winged bean seed contain short-chain peptides that competitively inhibit angiotensin-converting enzyme (ACE), reducing the conversion of angiotensin I to the vasoconstrictive angiotensin II, thereby lowering systemic [blood pressure](/ingredients/condition/heart-health). Phenolic compounds including flavonoids and condensed tannins donate hydrogen atoms to neutralize [reactive oxygen species](/ingredients/condition/antioxidant) and chelate pro-oxidant metal ions such as Fe²⁺ and Cu²⁺, disrupting Fenton-type oxidative chain reactions. Cytotoxic activity against colorectal cancer cell lines is hypothesized to involve induction of apoptotic pathways, though the specific molecular targets, such as caspase activation or p53 modulation, remain under investigation.

## Clinical Summary

Current evidence for winged bean seed is limited to preclinical stages, with no completed human clinical trials identified in the literature. An animal study (PMID: 29469915) demonstrated ACE-inhibitory activity of seed-derived peptides associated with [blood pressure](/ingredients/condition/heart-health) reduction, though species-specific pharmacokinetics limit direct extrapolation to humans. [Antioxidant](/ingredients/condition/antioxidant) capacity was quantified in vitro at 65.0% DPPH radical scavenging and 65.7% metal chelation efficiency (PMID: 24658538), which are moderate values compared to established antioxidant supplements but provide a mechanistic basis for further study. Anti-cancer cytotoxicity data come exclusively from cell-line assays, representing the lowest tier of oncological evidence, and no dosing, bioavailability, or safety data from human subjects are currently available.

## Nutritional Profile

Winged Bean Seeds (Psophocarpus tetragonolobus) are nutritionally dense legumes with approximate dry weight composition: Protein: 29–37% (high-quality protein with favorable amino acid profile including lysine ~6.5 g/100g protein, tryptophan, and threonine; digestibility ~75–80%, somewhat limited by antinutritional factors); Total fat: 15–20% (unusually high for a legume; rich in linoleic acid ~40% of fatty acids, oleic acid ~27%, palmitic acid ~15%, with notable tocopherols ~90–120 mg/100g primarily alpha- and gamma-tocopherol); Total carbohydrates: 28–35% (including dietary fiber ~13–16%, resistant starch, and oligosaccharides such as raffinose and stachyose); Ash/minerals: 3.5–4.5%. Key micronutrients per 100g dry seed: Calcium: 250–440 mg; Phosphorus: 390–490 mg; Iron: 8–13 mg (non-heme, bioavailability reduced by phytates; estimated absorption ~5–10%); Zinc: 3–5 mg; Magnesium: 170–210 mg; Potassium: 900–1100 mg; Copper: 1.0–1.5 mg; Manganese: 1.5–2.5 mg. Vitamins: Thiamine (B1): 0.9–1.2 mg; Riboflavin (B2): 0.2–0.4 mg; Niacin: 2.5–4.0 mg; Folate: 280–350 µg; Vitamin E (tocopherols): notably high compared to other legumes. Bioactive compounds: Phytates (inositol hexaphosphate): 1.5–2.8% dry weight (chelate iron, zinc, calcium reducing bioavailability by 30–60%; reduced by soaking, boiling, fermentation); Trypsin inhibitors: 15–25 TIU/mg (thermolabile, largely inactivated by cooking); Tannins/polyphenols: 0.3–1.0% (contribute to DPPH radical scavenging of ~65% and metal chelation of ~65.7% in vitro, PMID: 24658538); Lectin/hemagglutinins: present, heat-labile; Saponins: ~0.2–0.5%; Bioactive peptides: ACE-inhibitory peptides released upon [digestion](/ingredients/condition/gut-health) (demonstrated in vitro and animal models, PMID: 29469915); Cytotoxic compounds including possible lectins or phenolic fractions showing IC50 ~117.86 µg/mL against colorectal cancer cells in vitro (PMID: 41463421); Phytosterols: ~200–350 mg/100g (beta-sitosterol predominant). Bioavailability notes: Protein digestibility corrected amino acid score (PDCAAS) is moderate (~0.65–0.75); antinutritional factors significantly reduce mineral and protein bioavailability in raw seeds; cooking (boiling 30–45 min), soaking (12–24 h), autoclaving, germination, or fermentation substantially reduces trypsin inhibitors by ~80–95%, phytates by ~30–50%, and tannins by ~40–60%, improving overall nutritional availability. Fat-soluble tocopherols are relatively well-retained after boiling.

## Dosage & Preparation

No clinically studied human dosages exist. Preclinical references: In vitro cancer studies used 10-300 µg/mL ethanolic extract with IC50 at 117.86 µg/mL. Proteolysates achieved peak activity after 8-14 hours enzymatic hydrolysis. Safety data is insufficient; non-cGMP grade peptides were noted as toxic. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Winged bean seeds contain trypsin inhibitors and hemagglutinins (lectins) that can impair protein [digestion](/ingredients/condition/gut-health) and cause gastrointestinal discomfort if consumed raw; proper cooking or processing substantially reduces these antinutritional factors. Individuals taking antihypertensive medications, particularly ACE inhibitors such as lisinopril or enalapril, should exercise caution due to potential additive [blood pressure](/ingredients/condition/heart-health)-lowering effects from the seed's ACE-inhibitory peptides. No formal drug interaction studies exist in human populations, and safety data for pregnant or breastfeeding women are absent, warranting avoidance as a concentrated supplement during these periods. Allergic cross-reactivity with other legumes in the Fabaceae family (e.g., soy, peanut) is biologically plausible and should be considered in atopic individuals.

## Scientific Research

No human clinical trials have been conducted on winged bean seed supplementation. Evidence is limited to preclinical studies including in vitro cytotoxicity against HT-29 colorectal cancer cells (PMID: 41463421), ACE inhibition and [antioxidant activity](/ingredients/condition/antioxidant) of seed proteolysates (PMID: 24658538), and dose-dependent [blood pressure](/ingredients/condition/heart-health) reduction in spontaneously hypertensive rats (PMID: 29469915).

## Historical & Cultural Context

Winged bean has been consumed as a nutrient-dense food crop in Southeast Asian traditional diets for centuries, valued primarily for its high protein content rather than as a medicinal herb. Unlike many botanicals, it lacks extensive documentation in formal traditional medicine systems like Ayurveda or TCM, with recent interest focusing on its underutilized potential for functional foods.

## Synergistic Combinations

Hawthorn berry, Olive leaf extract, Magnesium, CoQ10, Grape seed extract

## Frequently Asked Questions

### What are the active compounds in winged bean seed responsible for health effects?

The primary bioactive compounds in winged bean seed include protein-derived ACE-inhibitory peptides, phenolic acids, flavonoids, and condensed tannins. These compounds are responsible for its antihypertensive, antioxidant, and preliminary cytotoxic properties. Seed protein content is exceptionally high at approximately 29–37% dry weight, making it a rich substrate for bioactive peptide generation through enzymatic hydrolysis.

### Can winged bean seed lower blood pressure?

Animal study evidence (PMID: 29469915) supports that peptides derived from winged bean seed protein hydrolysates inhibit ACE activity, a key enzyme in the renin-angiotensin system responsible for elevating blood pressure. This mechanism mirrors that of pharmaceutical ACE inhibitors like lisinopril, but the effect magnitude and effective dose in humans have not been established in clinical trials. Until human data are available, it cannot be recommended as a replacement or adjunct to prescribed antihypertensive therapy.

### Is winged bean seed safe to eat or take as a supplement?

Cooked winged bean seeds have a long history of dietary use across Southeast Asia and are generally regarded as safe when properly prepared, as heat inactivates trypsin inhibitors and lectins present in raw seeds. As an isolated supplement or extract, safety has not been systematically evaluated in human trials, and no established tolerable upper intake level exists. Individuals with legume allergies or those on ACE inhibitor medications should consult a healthcare provider before use.

### Does winged bean seed have anti-cancer properties?

In vitro assays have shown cytotoxic activity of winged bean seed extracts against colorectal cancer cell lines, suggesting pro-apoptotic or antiproliferative potential. However, cell-line studies represent the earliest stage of cancer research, and no animal or human trials have validated these effects in a living system. The specific cytotoxic compounds and their mechanisms of action, such as topoisomerase inhibition or apoptosis induction, have not yet been fully characterized.

### How does winged bean seed's antioxidant activity compare to other supplements?

Winged bean seed demonstrated 65.0% DPPH radical scavenging and 65.7% metal chelation activity in vitro (PMID: 24658538), which are moderate antioxidant values. For comparison, green tea extract and grape seed extract typically achieve DPPH scavenging above 80–90% in similar assays, placing winged bean seed in a mid-range category. In vitro antioxidant assays do not directly predict bioavailability or in vivo efficacy, so these figures should be interpreted cautiously.

### What is the current quality of clinical evidence for winged bean seed supplements?

Most evidence for winged bean seed comes from in vitro (laboratory) and animal studies rather than human clinical trials. The blood pressure-lowering effect has only been demonstrated in animal models, while antioxidant and anti-cancer properties have been shown only in test-tube studies. More rigorous human trials are needed to confirm whether these effects translate to real-world supplementation benefits.

### What are the best food sources of winged bean to get its nutrients naturally?

Winged bean pods, seeds, and leaves are all edible and consumed fresh in Southeast Asian cuisines, particularly in Philippines, Indonesia, and Thailand. The entire plant is nutritionally rich, making it possible to obtain winged bean's nutrients through traditional food preparation rather than supplements alone. Fresh or cooked winged beans may provide bioavailable forms of the compound that differ from extracted or concentrated supplement forms.

### Who should avoid winged bean seed supplements or use caution?

People with legume allergies should exercise caution, as winged bean is a member of the Fabaceae (legume) family and may trigger cross-reactivity. Those taking blood pressure medications should consult a healthcare provider before supplementing, given preliminary evidence of ACE-inhibitory activity that could potentiate drug effects. Pregnant and nursing women should seek medical guidance, as safety data in these populations is limited.

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