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Astragalus / Huang Qi (Astragalus membranaceus)
Materia Medica
Family: Fabaceae
Botanical name: Astragalus membranaceus (Fisch.) Bunge
Common names: Astragalus, Huang Qi, Milk Vetch Root
Parts used: Root
Growth habit: Perennial herb
Primary traditions: Traditional Chinese Medicine
Actions & Energetics
Traditional Chinese materia medica describes the root as sweet and slightly warm, entering the spleen and lung meridians. Recorded actions include tonifying qi, raising yang, consolidating the exterior, promoting urination, and supporting wound healing. It is classically regarded as a major qi tonic.
Botanical Description
Astragalus membranaceus is a perennial legume with pinnately compound leaves and pale yellow to white pea-like flowers. The medicinal material is the dried root, which is typically yellowish and fibrous when sliced. Both A. membranaceus and its variety mongholicus are accepted sources for Huang Qi in the Chinese Pharmacopoeia.
Traditional Indications
Classical Chinese texts record the root for qi deficiency with fatigue, poor appetite, spontaneous sweating, frequent colds, chronic non-healing sores, and edema. It appears in formulas such as Bu Zhong Yi Qi Tang and Huang Qi Jian Zhong Tang for raising yang and tonifying the middle. The root has been used for more than two thousand years.
Preparations & Dosage
Root Decoction
Traditional Chinese records commonly use 9–15 grams of dried root, simmered in water. Higher amounts (30–60 g) appear in some classical formulas for specific deficiency patterns.
Processed Root
Honey-fried root is traditionally used for stronger tonifying effects on the middle qi. Raw root is preferred for securing the exterior and promoting diuresis.
Constituents
The root contains triterpene saponins (astragalosides), polysaccharides, flavonoids, and amino acids. These compounds have been the focus of modern phytochemical and pharmacological research.
Modern Research
Laboratory and some human studies have examined immunomodulatory, adaptogenic, and anti-fatigue effects of the root and its extracts. Clinical data exist for fatigue and immune support in certain contexts, though results vary by preparation and dose. The herb remains one of the most studied Chinese tonics.
Adverse Effects
Ordinary traditional doses are generally well-tolerated in classical and modern literature. Mild digestive upset has been reported with higher intakes. Autoimmune conditions and concurrent immunosuppressive therapy warrant professional consideration.
Interactions & Contraindications
No major clinically established drug interactions are recorded for ordinary traditional doses. The root is not recommended in acute infections with strong exterior heat patterns in classical Chinese practice.
Pregnancy & Breastfeeding
Classical Chinese materia medica does not list strong restrictions for ordinary doses of Huang Qi. Modern data on concentrated extracts are limited.
Habitat & Cultivation
- Native range: Northern China, Mongolia, Korea
- Habitat: Dry slopes, grasslands, forest edges
- Cultivation: Widely cultivated in China for the root
Harvesting & Drying
Roots are harvested in autumn after several years of growth, cleaned, and dried. Slices are the common commercial form. Honey-processing is a classical method to modify the action.
History, Folklore & Spiritual Use
Huang Qi was first recorded in the Shennong Bencao Jing as a high-grade tonic. Later texts, including the Bencao Gangmu, describe it as a leading herb for consolidating the exterior and tonifying qi. It remains one of the most important tonic roots in Chinese herbal practice and appears in numerous classical formulas.
Materia Medica Summary
Astragalus / Huang Qi (Astragalus membranaceus) is a classical Chinese root tonic recorded for qi deficiency, fatigue, spontaneous sweating, and support of the exterior. Traditional decoctions use 9–15 g of dried root. Both the species and its variety mongholicus are accepted sources. The plant has been used for more than two thousand years.