Hyacinth Bean
- Chinese
- 扁豆
- Pinyin
- Bian Dou
- Latin
- Semen Dolichoris
Known in TCM as Bian Dou (扁豆), this sweet, slightly warm herb enters the Spleen and Stomach. Traditionally, it strengthens the Spleen and transforms dampness - Bian Dou is a classic gentle bean medicinal for weak digestion with damp heaviness, loose stool, and post-meal fatigue, most often applied for diarrhea, poor appetite, and digestive weakness. Modern research has identified Triterpene among its active constituents.
Part used: Seed
Also Known As
Latin: Semen Dolichoris | Pinyin: Bian Dou | Chinese: 扁豆
TCM Properties
- Taste
- sweet
- Temperature
- slightly warm
- Channels
- Spleen, Stomach
Traditional Use
Primary Actions
- Strengthens the Spleen and transforms dampness - Bian Dou is a classic gentle bean medicinal for weak digestion with damp heaviness, loose stool, and post-meal fatigue.
- Harmonizes the middle and relieves summer-damp - it is used when humid weather causes vomiting, diarrhea, poor appetite, chest oppression, or a sluggish abdominal feeling.
- Stops diarrhea and helps with damp leukorrhea - especially in people whose discharge or loose stool reflects chronic Spleen weakness with lingering dampness.
Secondary Actions
- This broader Bian Dou entry should not be collapsed into the later Bai Bian Dou page. In older pharmacy usage, Bian Dou can function as the general seed record while Bai Bian Dou remains the more specific white-seed medicinal identity.
- Processing matters: raw seed leans more toward summer-damp and detoxifying discussion, while stir-fried seed is more centered on Spleen support and diarrhea control.
Classic Formulas
- Xiang Ru San - classic summer-damp formula context where Bian Dou helps harmonize the middle and stop vomiting or diarrhea.
- Shen Ling Bai Zhu San - digestive-deficiency pattern in which bean-like Spleen support and damp control are central.
- Bian Dou with Huo Xiang, Shan Yao, or Bai Zhu - common pairing logic for poor appetite, loose stool, and damp-heavy digestion.
Classical References
- Official Chinese materia medica references describe Bian Dou as sweet and slightly warm, entering the Spleen and Stomach to strengthen the Spleen, transform dampness, and relieve summer-heat.
- Traditional texts repeatedly pair it with vomiting, diarrhea, poor appetite, and leukorrhea when weakness and dampness coexist.
- Compared with the flower and seed coat, the seed is considered the strongest at actually tonifying the Spleen.
Modern Research
Active Compounds
- Triterpene glycosides - a major modern phytochemical focus in Dolichos lablab seeds
- Fatty acids such as linoleic and oleic acid - part of the nutritional profile described in official references
- Lectins and storage proteins - relevant to both bioactivity research and raw-bean toxicity concerns
- Trigonelline, vitamins, and polyphenolic compounds - supportive food-medicine constituents
Studied Effects
- A 2025 seed study identified multiple terpenoid glycosides from Dolichos lablab with in vitro anti-inflammatory activity, reinforcing the idea that the seed itself has modern pharmacologic interest beyond its food role (PMID 40333725).
- A 2019 phytochemical paper characterized triterpene glycosides from Dolichos lablab seeds, expanding the seed-specific chemistry base for Bian Dou (PMID 31155567).
- A 2014 processing study showed that preparation conditions meaningfully affect the polyphenol content and antioxidant capacity of Dolichos lablab, which fits the traditional emphasis on processing differences (PMID 24425975).
PubMed References
Safety & Interactions
Contraindications
- Severe dry constipation without dampness
- Marked heat or inflammatory patterns in which a gentle Spleen bean is not the right match
Cautions
- Raw or undercooked hyacinth bean contains toxic proteins and lectin-like factors that can cause gastrointestinal distress.
- Most modern evidence is phytochemical or preclinical rather than direct clinical proof for classical digestive indications.
- Prepared medicinal seed and ordinary food products are not identical in processing or intended dosing.
Conditions
- Diarrhea Traditional ★★★★☆ JSON
- Poor Appetite Traditional ★★★☆☆ JSON
- Digestive Weakness Traditional ★★★☆☆ JSON
- Leukorrhea Traditional ★★☆☆☆ JSON
Frequently Asked Questions
What is Hyacinth Bean used for?
Hyacinth Bean is traditionally used to Strengthens the Spleen and transforms dampness - Bian Dou is a classic gentle bean medicinal for weak digestion with damp heaviness, loose stool, and post-meal fatigue., Harmonizes the middle and relieves summer-damp - it is used when humid weather causes vomiting, diarrhea, poor appetite, chest oppression, or a sluggish abdominal feeling., Stops diarrhea and helps with damp leukorrhea - especially in people whose discharge or loose stool reflects chronic Spleen weakness with lingering dampness.. Research has investigated its effects on: A 2025 seed study identified multiple terpenoid glycosides from Dolichos lablab with in vitro anti-inflammatory activity, reinforcing the idea that the seed itself has modern pharmacologic interest beyond its food role (PMID 40333725).; A 2019 phytochemical paper characterized triterpene glycosides from Dolichos lablab seeds, expanding the seed-specific chemistry base for Bian Dou (PMID 31155567)..
What are other names for Hyacinth Bean?
Hyacinth Bean is also known as Lablab Bean, Dolichos Seed. In TCM: 扁豆 (Bian Dou); Semen Dolichoris.
Is Hyacinth Bean safe during pregnancy?
The safety of Hyacinth Bean during pregnancy has not been established. Consult a qualified healthcare provider before use.
What are the contraindications for Hyacinth Bean?
Hyacinth Bean should not be used in: Severe dry constipation without dampness; Marked heat or inflammatory patterns in which a gentle Spleen bean is not the right match. Consult a qualified practitioner before use.