Herbal Monograph
Astragalus
Astragalus membranaceus (Fisch.) Bunge
Fabaceae (Leguminosae)
Premier qi tonic and immune shield from 2000 years of Chinese herbal tradition
Overview
Plant Description
Astragalus membranaceus is a perennial herbaceous legume growing 25-40 cm tall (occasionally to 80 cm in cultivation). The stems are erect to ascending, branching, and covered with fine appressed hairs. Leaves are odd-pinnate with 12-18 pairs of small, elliptical to oblong leaflets (5-10 mm long), each with a mucronate apex and sparse pubescence on the lower surface. Stipules are triangular-lanceolate. Inflorescences are axillary racemes bearing 10-25 pale yellow to cream-colored papilionaceous (butterfly-shaped) flowers, each approximately 12-18 mm long. The calyx is tubular with short teeth. The fruit is an inflated, membranous legume pod (hence the species name 'membranaceus'), 2-3 cm long, semi-elliptical, with a persistent style. Seeds are kidney-shaped, dark brown to black. The root — the medicinal part — is a long, cylindrical taproot, yellowish-brown externally and yellowish-white internally, fibrous and somewhat sweet-tasting when chewed. The root develops extensive lateral branching and can reach 30-90 cm in length in cultivated plants.
Habitat
Native to temperate grasslands, open woodlands, forest margins, and shrublands at elevations of 800-2000 meters. Prefers well-drained, sandy to loamy soils with slightly alkaline to neutral pH. Grows in dry, sunny positions. Tolerant of cold temperatures (hardy to USDA Zone 4) and moderate drought once established. Found naturally along riverbanks, meadows, and sparse forest edges in its native range.
Distribution
Native to northern China (Heilongjiang, Jilin, Liaoning, Inner Mongolia, Hebei, Shanxi, Gansu, Ningxia, Qinghai, Xinjiang, Sichuan, Tibet), Mongolia, Korea, and Siberia (Russian Far East). The majority of commercial production occurs in the Chinese provinces of Shanxi, Inner Mongolia, Heilongjiang, and Gansu. Var. mongholicus is more prevalent in northern China and Mongolia, while the type variety is distributed more broadly. Now cultivated extensively as a commercial crop throughout northern China, with some cultivation in Korea, Japan, and experimental cultivation in North America and Europe.
Parts Used
Root (Radix Astragali / Huang qi)
Preferred: decoction
The dried root of 4-5 year old plants is the official drug in all pharmacopeias. Both the type species (A. membranaceus) and var. mongholicus are accepted sources. The root is typically sold in thin oblique slices (tongue depressor-shaped), yellowish-brown externally with a fibrous, yellowish-white interior and characteristic sweet taste. Two processed forms exist in TCM: raw root (sheng huang qi) for exterior defensive qi and diuretic action, and honey-roasted root (zhi huang qi) for interior tonification and raising of qi.
Key Constituents
Triterpene saponins (Astragalosides)
Astragalosides are responsible for many of the cardioprotective, anti-inflammatory, and immunomodulatory effects attributed to astragalus. Astragaloside IV is the most extensively studied individual compound, with over 1000 published studies. Cycloastragenol is the focus of telomerase-activation and anti-aging research. Total saponin content in quality root material ranges from 0.5-3.5% depending on variety, age, and growing conditions.
Polysaccharides (APS — Astragalus Polysaccharides)
Astragalus polysaccharides (APS) are the principal immunomodulatory constituents. They enhance macrophage phagocytosis, promote lymphocyte proliferation, increase natural killer (NK) cell activity, and stimulate cytokine production (IL-2, IFN-gamma, TNF-alpha). APS also demonstrate antitumor activity through immune enhancement rather than direct cytotoxicity. In Chinese clinical practice, injectable APS preparations are used adjunctively during cancer chemotherapy to mitigate immunosuppression and protect white blood cell counts.
Flavonoids
The isoflavone constituents (formononetin, calycosin) contribute to the cardiovascular-protective and phytoestrogenic effects of astragalus. Total flavonoid content is used alongside saponin content as a quality parameter. Flavonoids contribute to the antioxidant capacity, cardioprotective effects, and may play a role in the anti-diabetic and neuroprotective activities observed in pharmacological studies. The Chinese Pharmacopoeia specifies minimum total flavonoid content.
Trace minerals and amino acids
Trace mineral content, particularly selenium, may contribute to the antioxidant and immune-supporting effects of astragalus. The mineral profile supports the traditional TCM concept of astragalus as a 'qi tonic' that builds vitality and strength. Selenium content adds to the hepatoprotective and anticancer profiles.
Herbal Actions
Modulates and balances immune function
The most well-documented pharmacological action of astragalus. Polysaccharides (APS) enhance macrophage phagocytosis, increase NK cell cytotoxicity, promote T-cell proliferation, and stimulate interferon and interleukin production. Unlike simple immunostimulants, astragalus exhibits bidirectional immune modulation — enhancing underactive immunity while showing anti-inflammatory effects in overactive immune states. This dual action underlies its traditional use as a tonic rather than a short-term immune stimulant.
[1, 13, 14, 18]Helps the body adapt to stress and restore homeostasis
Classified as an adaptogen based on its ability to increase nonspecific resistance to stress, normalize physiological function, and enhance stamina and recovery. In TCM, astragalus is one of the premier 'qi tonic' herbs — used to strengthen the body's overall vitality and resistance rather than to treat specific diseases. Preclinical studies demonstrate anti-fatigue, anti-stress, and HPA-axis modulating effects. Its adaptogenic profile is distinct from Rhodiola or Ashwagandha, being warming and primarily immune-oriented.
[1, 2, 17]Strengthens and tones the heart muscle
Astragaloside IV demonstrates cardioprotective effects including positive inotropic activity, protection against ischemia-reperfusion injury, anti-fibrotic effects on cardiac tissue, and improvement of left ventricular function in animal models. Clinical systematic reviews for viral myocarditis show improved cardiac function markers. The traditional use of astragalus for heart weakness and shortness of breath aligns with modern findings.
[6, 13, 19]Protects the liver from damage
Astragalus extracts protect against chemical hepatotoxicity (CCl4, D-galactosamine) in animal models, reduce hepatic fibrosis markers, and demonstrate antioxidant activity in liver tissue. Saponins and polysaccharides both contribute. Used traditionally in TCM formulas for chronic hepatitis and liver cirrhosis.
[1, 13]Increases urine production and output
Mild diuretic effect documented in pharmacological studies and consistent with TCM indication for edema. The raw (unprocessed) root form is traditionally preferred for diuretic action. Mechanism involves increased renal blood flow and glomerular filtration rate. Relevant to the use of astragalus in diabetic nephropathy and chronic kidney disease formulas.
[1, 2, 13]Prevents or slows oxidative damage to cells
Flavonoids (calycosin, formononetin, kaempferol) and polysaccharides contribute to free radical scavenging, upregulation of endogenous antioxidant enzymes (SOD, catalase, glutathione peroxidase), and protection against lipid peroxidation. Selenium content further supports the antioxidant profile.
[13, 18, 19]Reduces inflammation
Astragalosides inhibit NF-kB signaling, reduce pro-inflammatory cytokine expression (TNF-alpha, IL-1beta, IL-6), and modulate inflammatory mediator pathways. Anti-inflammatory effects have been demonstrated in models of gastrointestinal inflammation, neuroinflammation, and systemic inflammation. The anti-inflammatory action complements rather than contradicts the immunomodulatory effects.
[14, 15, 20]Promotes the discharge of mucus from the respiratory tract
Traditional use for chronic cough with profuse sputum, particularly in debilitated patients. The TCM indication relates to strengthening lung qi to improve expectoration rather than a direct mucolytic action. Used in respiratory formulas for recurrent infections and chronic bronchitis.
[2, 13]Therapeutic Indications
Immune System
Recurrent upper respiratory infections (prevention)
One of the best-established traditional and modern uses. Astragalus enhances NK cell activity, increases IFN-gamma production, and improves mucosal immunity. The classic TCM formula Yu Ping Feng San (Jade Windscreen Powder — astragalus, atractylodes, siler) is specifically indicated for recurrent colds and flu in immune-depleted individuals. Clinical studies show reduced frequency and duration of upper respiratory infections with prophylactic astragalus use.
[1, 2, 13]Immune deficiency and cancer-related immunosuppression
Extensive Chinese clinical literature supports adjunctive use of astragalus-based formulas during cancer chemotherapy to protect white blood cell counts, enhance NK cell activity, and reduce adverse effects of cytotoxic drugs. Multiple systematic reviews and meta-analyses of Chinese RCTs report improved quality of life and immune markers when astragalus preparations are added to conventional chemotherapy regimens.
[13, 15, 17]Chronic fatigue with immune compromise
Traditional TCM indication for patients with persistent fatigue, spontaneous sweating, and susceptibility to infection — the classic 'qi deficiency' picture. The adaptogenic and immune-modulating properties support this use. Limited controlled clinical trial data specific to chronic fatigue syndrome.
[1, 2]Cardiovascular System
Viral myocarditis
A systematic review of 28 RCTs with 2522 participants found that Astragalus membranaceus preparations significantly improved cardiac function markers, reduced myocardial enzyme levels, and enhanced clinical outcomes in viral myocarditis when added to conventional treatment. Both injectable and oral forms were studied.
[6, 13]Congestive heart failure (adjunctive)
Traditional use in TCM for heart qi deficiency with palpitations, shortness of breath, and edema. Astragaloside IV shows positive inotropic effects and cardioprotective activity in preclinical models. Injectable astragalus preparations are used in Chinese hospitals for CHF. Limited Western-style RCT data.
[2, 13, 19]Cardiovascular protection and atherosclerosis prevention
Preclinical evidence demonstrates anti-atherosclerotic effects through antioxidant activity, reduction of foam cell formation, endothelial protection, and lipid-lowering effects. Formononetin and calycosin may contribute to vascular protection. Clinical data is limited to observational and small interventional studies.
[13, 19]Endocrine System
Type 2 diabetes mellitus (adjunctive)
Multiple Chinese clinical studies report improvements in fasting blood glucose, HbA1c, and insulin sensitivity when astragalus preparations are added to conventional diabetes management. Polysaccharides demonstrate hypoglycemic activity through enhanced insulin sensitivity and pancreatic beta-cell protection.
[13, 18]Metabolic syndrome
Preliminary evidence supports beneficial effects on lipid profiles, blood glucose regulation, and inflammatory markers associated with metabolic syndrome. Astragalus polysaccharides improve insulin sensitivity and reduce oxidative stress in animal models of metabolic syndrome.
[13, 19]Urinary System
Diabetic nephropathy (adjunctive)
An updated systematic review and meta-analysis of RCTs found that Astragalus membranaceus preparations as adjunctive therapy to conventional treatment significantly reduced proteinuria (24-hour urinary protein, UAER) and improved serum albumin in patients with diabetic kidney disease. Astragaloside I has shown specific renoprotective effects in diabetic kidney disease models through attenuation of renal fibrosis.
[7, 8, 10]Chronic kidney disease (adjunctive)
Preliminary clinical evidence and pharmacological studies suggest astragalus may slow progression of chronic kidney disease through anti-fibrotic, anti-inflammatory, and antioxidant mechanisms in renal tissue. Used traditionally in Chinese nephrology practice as part of herbal formulas.
[11, 13]Edema due to qi deficiency
Traditional TCM indication for edema associated with spleen qi deficiency — mild, generalized puffiness worse in the morning, with fatigue and poor appetite. The mild diuretic effect combined with spleen qi tonification addresses the underlying pattern. Raw (unprocessed) astragalus root is preferred for this indication.
[1, 2]Hepatobiliary System
Chronic hepatitis (adjunctive)
Traditional use in TCM for chronic hepatitis and liver fibrosis, often in combination formulas. Astragalus extracts demonstrate hepatoprotective effects in animal models of liver injury. Used in Chinese clinical practice as an adjunct to antiviral therapy for chronic hepatitis B. Controlled clinical data from Western-style trials is limited.
[1, 13]Respiratory System
Recurrent respiratory tract infections (prevention)
The hallmark TCM application — strengthening 'lung qi' and 'Wei qi' (defensive qi) to prevent respiratory infections. The formula Yu Ping Feng San (Jade Windscreen) is the classic representation. Immune-enhancing effects on mucosal immunity, secretory IgA, and NK cell activity support this use.
[1, 2, 13]Chronic bronchitis with deficiency pattern
Used in TCM for chronic cough with profuse clear-white sputum, shortness of breath, and fatigue — the lung qi deficiency pattern. Often combined with other qi-tonifying and lung-moistening herbs. The expectorant and immune-supportive actions are relevant.
[2]Lymphatic System
Lymphedema and chronic lymphatic insufficiency
Traditional TCM use for fluid retention and swelling related to impaired fluid metabolism (qi deficiency with dampness accumulation). The diuretic and qi-tonifying actions are relevant. Modern clinical evidence is limited to case series and traditional practice reports.
[2]Energetics
Temperature
warm
Moisture
slightly moist
Taste
Tissue States
cold/depression, damp/stagnation
In TCM, astragalus is classified as sweet in taste and slightly warm in nature, entering the Lung and Spleen channels. Its warming, sweet, and slightly moist quality makes it a premier qi tonic — it strengthens digestion (Spleen qi), raises yang, consolidates the exterior (Wei qi / defensive qi), and promotes fluid metabolism. The warming nature means it is traditionally avoided in excess heat conditions, yin deficiency with heat signs, or acute infections with fever. In Western energetic terms, astragalus is suited to cold, deficient, and damp tissue states — the person who catches every cold, feels chronically fatigued, has poor digestion, and tends toward edema or loose stools.
Traditional Uses
Traditional Chinese Medicine (TCM)
- One of the 50 fundamental herbs in TCM, classified as a 'superior' (shang pin) tonic in the Shennong Bencao Jing (circa 200 CE)
- Primary qi tonic (bu qi yao) — tonifies spleen qi, lung qi, and raises yang
- Consolidates the exterior and stops spontaneous sweating (gu biao zhi han)
- Promotes fluid metabolism and reduces edema (li shui xiao zhong)
- Generates flesh and promotes wound healing (tuo du sheng ji) — for chronic non-healing ulcers and sores
- Key ingredient in Yu Ping Feng San (Jade Windscreen Powder) for recurrent colds and weak immunity
- Key ingredient in Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) for prolapse, chronic fatigue, and digestive weakness
- Key ingredient in Buyang Huanwu Tang (Tonify the Yang to Restore Five-Tenths Decoction) for post-stroke recovery — large doses (60-120g) of astragalus
- Used in combination with Angelica sinensis (Dang gui Bu Xue Tang) for blood deficiency and postpartum recovery
"The Shennong Bencao Jing (Divine Farmer's Materia Medica) classifies Huang qi as a 'superior' herb: 'It mainly treats carbuncles and chronic sores, expels pus and relieves pain, treats great wind leprosy... supplements deficiency... It should be taken for a long time.' Li Shizhen's Bencao Gangmu (1578) states: 'Huang qi is the premier medicine for supplementing qi. It is sweet and warm, consolidates the exterior, stops sweating, promotes urination, and eliminates edema.' The Yixue Zhongzhong Canxi Lu notes it as essential for raising the clear yang and treating organ prolapse."
Mongolian traditional medicine
- Used as a general tonic for chronic weakness and debility
- Treatment of chronic wounds and skin ulcers
- Strengthening of the elderly and convalescent
- Included in compound formulas for respiratory and digestive conditions
"In Mongolian traditional medicine, astragalus root is valued as a general tonic and wound healer. The Mongolian variety (var. mongholicus) is the primary wild-harvested source, with a long history of use among nomadic peoples of the Central Asian steppe."
[1]
Korean traditional medicine (Hanyak)
- Known as 'hwanggi' — used similarly to Chinese applications as a qi tonic
- Included in tonic formulas for chronic fatigue, post-illness recovery, and immune support
- Used for promoting recovery after surgery or childbirth
- Combined with ginseng (Panax ginseng) for synergistic qi tonification
"Korean traditional medicine adopted the Chinese material medica tradition, including hwanggi (Huang qi) as a fundamental tonic herb. It is included in the Korean Pharmacopoeia and widely used in Korean herbal clinical practice."
Modern Research
Astragalus for viral myocarditis: clinical and preclinical systematic review
Systematic review of 28 randomized clinical controlled studies (2522 participants) and 16 animal studies (634 animals) evaluating Astragalus membranaceus for viral myocarditis.
Findings: In clinical studies, astragalus preparations significantly improved cardiac function markers, reduced myocardial enzyme levels (CK-MB, LDH), and enhanced total effective rate compared to conventional treatment alone. In preclinical studies, astragalus attenuated myocardial injury through antioxidant, anti-inflammatory, and antiviral mechanisms. The review identified improved left ventricular ejection fraction and reduced inflammatory cytokines as consistent findings.
Limitations: Most included clinical trials were Chinese-language studies with variable methodological quality. Risk of bias was moderate to high in many trials. Heterogeneity in astragalus preparations (oral vs injectable, single herb vs formula). Limited blinding in several studies.
[6]
Astragalus as adjunctive therapy for diabetic kidney disease: systematic review and meta-analysis
Updated systematic review of randomized controlled trials evaluating A. membranaceus preparations as adjunctive therapy to conventional treatment for diabetic kidney disease (DKD). Nine databases and five clinical trial registries searched.
Findings: Astragalus preparations significantly reduced 24-hour urinary protein excretion, urinary albumin excretion rate (UAER), serum creatinine, and blood urea nitrogen compared to conventional therapy alone. Improvements in serum albumin and fasting blood glucose were also observed. The renoprotective effects were consistent across different astragalus preparation types (oral decoction, injection, combined formulas).
Limitations: Most trials originated from China with variable methodological rigor. Small sample sizes in individual studies. Heterogeneity in preparation types, dosages, and treatment durations. Risk of publication bias. Lack of long-term follow-up data on hard renal endpoints (ESRD, dialysis).
[7]
Astragalus combined with RAAS blockers for stage III diabetic nephropathy: meta-analysis
Systematic review and meta-analysis evaluating the efficacy of astragalus combined with renin-angiotensin-aldosterone system (RAAS) blockers for stage III diabetic nephropathy.
Findings: The combination of astragalus with RAAS blockers (ACE inhibitors or ARBs) showed significantly greater reduction in proteinuria, improvement in renal function markers, and better glycemic control compared to RAAS blockers alone. The combination was well-tolerated with no significant increase in adverse events.
Limitations: Included studies were predominantly from Chinese databases. Moderate heterogeneity. Variability in astragalus preparations and dosing. Relatively short follow-up periods in most studies.
[8]
Anti-inflammatory and immunostimulatory activities of astragalosides
Investigation of the dual immunostimulatory and anti-inflammatory effects of astragaloside compounds, focusing on the mechanism by which astragalus exhibits both immune-boosting and immune-regulatory activity.
Findings: Astragaloside I (ASI) increases CD45 phosphatase activity, which differentially regulates immune cell activation. In resting immune cells, ASI enhances activation (immunostimulatory effect); in already-activated immune cells under inflammatory conditions, ASI suppresses excessive activation (anti-inflammatory effect). This bidirectional mechanism explains the clinical observation that astragalus can enhance immune function while simultaneously reducing inflammatory damage.
Limitations: In vitro study using isolated cell lines. The bidirectional mechanism requires further validation in vivo and in clinical settings. Specific concentration-response relationships may differ from achievable tissue concentrations after oral administration.
[14]
Anti-aging implications: telomerase activation by cycloastragenol
Review of the anti-aging potential of Astragalus membranaceus, focusing on cycloastragenol and its activation of telomerase via hTERT upregulation.
Findings: Cycloastragenol (the aglycone of astragaloside IV) activates telomerase by upregulating hTERT gene expression, leading to telomere elongation in human cells. In vivo studies in aged mice showed improved immune function, reduced oxidative stress, and extended healthspan. Additional anti-aging mechanisms include antioxidant activity, reduction of advanced glycation end products (AGEs), enhancement of autophagy, and modulation of cellular senescence pathways. The commercially available product TA-65 (purified cycloastragenol) has been studied in small human trials.
Limitations: Most telomerase-activation data is preclinical. Small sample sizes in human TA-65 studies. Long-term safety of telomerase activation remains a theoretical concern (potential cancer risk). Cycloastragenol is a minor metabolite — whole root extract may not deliver therapeutically relevant concentrations. Extrapolation from in vitro telomerase activation to meaningful clinical anti-aging effects is premature.
Comprehensive review of phytochemistry, pharmacology, and clinical application of Astragali Radix
Comprehensive review of the botany, phytochemistry, pharmacology, and clinical application of Astragali Radix, covering over 400 identified natural compounds and their biological activities.
Findings: Over 400 natural compounds have been identified in Astragali Radix, primarily saponins, flavonoids, and polysaccharides. Documented pharmacological activities include immunomodulatory, anti-hyperglycemic, antioxidant, anti-aging, anti-inflammatory, antiviral, antitumor, cardioprotective, and anti-diabetic effects with minimal side effects. The review confirmed astragalus has been safely consumed as a tonic in China for more than 2000 years. Quality control focuses on astragaloside IV and calycosin-7-O-glucoside content.
Limitations: Narrative review covering heterogeneous study types. Much of the clinical evidence originates from Chinese-language literature with variable methodological quality. The breadth of claimed pharmacological activities requires individual validation through rigorous clinical trials.
[19]
Astragalus membranaceus botanical characteristics, phytochemistry, and pharmacology review
Review of the botanical characteristics, phytochemistry, and pharmacology of Astragalus membranaceus (Huangqi), synthesizing available evidence from traditional use through modern pharmacological investigation.
Findings: Confirmed multiple pharmacological activities: immune stimulant, tonic, antioxidant, hepatoprotectant, diuretic, antidiabetic, anticancer, and expectorant. Identified the three main active constituent classes (astragalosides, polysaccharides, flavonoids) and their respective pharmacological contributions. Documented extensive traditional use and increasing modern validation.
Limitations: Many cited pharmacological studies were preclinical. Heterogeneity in extract preparations across studies. Limited number of high-quality RCTs for most individual indications.
[13]
Anticancer activity of Astragalus membranaceus
Review of the anticancer mechanisms and adjuvant therapeutic potential of Astragalus membranaceus in cancer treatment, including immune enhancement and chemotherapy protection.
Findings: Astragalus demonstrates anticancer effects through multiple mechanisms: immune enhancement (NK cell activation, T-cell stimulation), induction of apoptosis in cancer cells, inhibition of tumor angiogenesis, and reversal of multidrug resistance. As an adjuvant to chemotherapy, astragalus preparations reduce side effects (neutropenia, fatigue, nausea), protect against organ toxicity, and may improve overall survival and quality of life. Specific activity has been demonstrated against colorectal, gastric, lung, breast, and liver cancers in preclinical and clinical settings.
Limitations: Much of the anticancer clinical evidence comes from Chinese studies with methodological limitations. Mechanisms are primarily demonstrated in preclinical models. Optimal dosing, preparation type, and treatment timing remain to be defined. Use as monotherapy for cancer is not supported.
Astragalus membranaceus for cancer-related fatigue: meta-analysis of RCTs
Systematic review and meta-analysis of randomized controlled studies evaluating the efficacy of Astragalus membranaceus (Huang qi) preparations for cancer-related fatigue.
Findings: Astragalus-based preparations significantly reduced cancer-related fatigue scores compared to controls. Improvements were observed across multiple cancer types and treatment stages. The effect was consistent across different astragalus preparation forms.
Limitations: Predominantly Chinese-language studies. Variable methodological quality. Heterogeneity in fatigue assessment tools, cancer types, and concurrent treatments. Risk of publication bias.
[9]
Protection against inflammation and gastrointestinal cancers
Review of the protective effects of Astragalus membranaceus against inflammation and gastrointestinal cancers, focusing on molecular mechanisms of its chemical constituents.
Findings: Astragalus-based treatments demonstrated significant amelioration of chemotherapy-induced toxicity and immune system damage. Saponins, polysaccharides, and flavonoids each contribute to anti-inflammatory and anticancer effects through distinct but complementary pathways including NF-kB inhibition, MAPK modulation, and immune cell activation. Specific evidence for protective effects in gastric and colorectal cancer contexts.
Limitations: Review of predominantly preclinical data. Translation to clinical practice requires further controlled trials. Mechanism studies used isolated compounds at concentrations that may not reflect whole-root clinical use.
[15]
Preparations & Dosage
Decoction
Strength: 9-30 g dried sliced root per daily dose in 500-750 mL water
The traditional and most common preparation in TCM. Add 9-30 g of dried root slices to 500-750 mL of cold water. Bring to a boil, then reduce heat and simmer for 30-45 minutes (astragalus requires prolonged decoction due to its dense, fibrous root). Strain and drink warm. In traditional practice, roots may be decocted a second time with fresh water to extract remaining constituents. For formulas, astragalus is typically decocted together with other herbs. In the classical formula Buyang Huanwu Tang, very large doses (60-120 g) are used.
9-30 g dried root daily (standard TCM dosage). Up to 60-120 g in specific classical formulas (e.g., Buyang Huanwu Tang for post-stroke) under practitioner supervision.
Divided into 2-3 doses throughout the day
May be used long-term as a tonic (weeks to months). TCM practitioners typically prescribe in courses of 2-4 weeks with reassessment. Traditionally taken during autumn and winter for immune prevention.
Children 4-12 years: 3-9 g daily in decoction, as directed by a practitioner
Decoction is the standard TCM preparation and the form used in most Chinese clinical studies. The prolonged simmering is necessary to extract polysaccharides and saponins from the dense, fibrous root. Two processed forms are distinguished: raw root (sheng huang qi) is preferred for consolidating the exterior, diuresis, and promoting wound healing; honey-roasted root (zhi huang qi) is preferred for internal tonification and raising qi. The sweet taste of the decoction makes it palatable. Astragalus is frequently combined with other herbs — rarely used as a single-herb decoction in traditional practice.
Tincture
Strength: 1:5, 40-50% ethanol (dried root)
Hydroethanolic extraction of dried root. Standard ratio 1:5 in 40-50% ethanol. Macerate chopped or coarsely ground dried root for 4-6 weeks with daily agitation. Press and filter. The higher ethanol percentage and longer maceration time (compared to leaf or flower tinctures) is necessary due to the dense, fibrous nature of the root material.
2-4 mL (40-80 drops) three times daily
Three times daily
May be used for extended periods (weeks to months) as a tonic. Reassess periodically.
Children 4-12 years: 0.5-1.5 mL diluted in water, 2-3 times daily (consult practitioner)
Tincture is the most common Western herbal preparation form. Provides good extraction of both saponins (astragalosides) and flavonoids. Polysaccharide extraction is limited in high-ethanol tinctures — decoction or glycerite is preferred when polysaccharide content is prioritized. Tincture is convenient for long-term daily use and has a long shelf life (3-5 years).
Capsule / Powder
Strength: 400-500 mg powdered root per capsule (crude herb equivalent)
Dried root, finely powdered and encapsulated. Select root material that meets pharmacopeial quality standards (minimum 0.040% astragaloside IV). Capsules typically contain 400-500 mg of powdered root.
2-6 capsules (1000-3000 mg) daily in divided doses
2-3 times daily with meals
May be used long-term. Reassess periodically.
Not recommended in capsule form for young children; use decoction or glycerite
Capsules provide a convenient alternative to decoction for daily supplementation. The whole powdered root retains all constituent classes (polysaccharides, saponins, flavonoids). Bioavailability of saponins from powdered root may be lower than from decoction or extract. Quality varies significantly between commercial products — choose products with third-party testing and astragaloside IV content verification per Chinese Pharmacopoeia standards (minimum 0.040% astragaloside IV).
Standardized Extract
Strength: Varies. Common standardizations: 0.3-0.5% astragaloside IV (saponin extract), 40-70% polysaccharides (APS extract), or specific cycloastragenol content.
Concentrated extract standardized to astragaloside IV content (typically 0.3-0.5% or higher) or total polysaccharide content (typically 40-70% for polysaccharide-enriched extracts). Available as capsules, tablets, or granules. Cycloastragenol-enriched extracts (e.g., TA-65) are a specialized subtype targeting telomerase activation.
250-500 mg standardized extract, 2-3 times daily. For polysaccharide-enriched extracts: 250-750 mg daily. For cycloastragenol (TA-65): 5-25 mg daily (per manufacturer guidelines).
2-3 times daily
Clinical studies have used 2-6 months of continuous supplementation.
Not well-established for standardized extracts in children
Standardized extracts provide consistent, quantified doses of specific active constituents. Saponin-standardized extracts are preferred for cardiovascular and anti-inflammatory indications; polysaccharide-enriched extracts are preferred for immune modulation. In Chinese clinical practice, injectable polysaccharide preparations (Astragalus Injection / Huang qi zhusheye) are used in hospitals for cancer adjunctive therapy and cardiovascular conditions — these are prescription medical products not available as supplements.
Glycerite
Strength: 1:5, 60% glycerin / 40% water
Extraction of dried root in vegetable glycerin and water (typically 60:40 glycerin to water ratio). Macerate finely chopped dried root for 6-8 weeks with frequent agitation. Press and filter.
3-5 mL three times daily
Three times daily
May be used for extended periods
Children 2-6 years: 1-2 mL, 2-3 times daily. Children 6-12 years: 2-3 mL, 2-3 times daily.
Alcohol-free preparation preferred for children, during pregnancy, and for individuals avoiding alcohol. Glycerites effectively extract polysaccharides (better than tinctures) but may be less efficient for saponin extraction. The sweet taste of both glycerin and astragalus root makes this a very palatable preparation. Good choice when immune-modulating polysaccharide content is the therapeutic priority.
[3]
Syrup
Strength: Concentrated decoction (approximately 2:1 reduction) combined 1:1 with honey
Prepare a strong decoction of dried root (30-60 g in 500 mL water, simmered down to 250 mL). Strain thoroughly. Add equal volume of raw honey (250 mL) to the warm (not hot) decoction. Stir until dissolved. Store in sterilized glass jar in refrigerator.
1-2 tablespoons (15-30 mL) 2-3 times daily
2-3 times daily
Use within 2-3 months (refrigerated). May be prepared in small batches for seasonal immune support.
Children over 2 years: 1-2 teaspoons (5-10 mL) 2-3 times daily. Not for infants under 1 year (honey contraindicated).
Syrup is a traditional preparation that combines the polysaccharide-rich decoction with honey, which itself has immunomodulatory and antimicrobial properties. Particularly suitable for respiratory and immune indications, and for children who resist taking decoctions. The honey-astragalus combination echoes the traditional Chinese honey-roasting (zhi) processing method. Refrigerate and use within 2-3 months.
Safety & Interactions
Class 1
Can be safely consumed when used appropriately (AHPA Botanical Safety Handbook)
Contraindications
In TCM theory, astragalus is a warming qi tonic that 'consolidates the exterior.' During acute febrile illness with excess patterns (high fever, strong pulse, thick yellow tongue coat), astragalus is traditionally contraindicated as it may 'lock in' the pathogen by strengthening the exterior defensive qi before the pathogen has been expelled. This is a pattern-based contraindication from TCM, not a toxicity concern. After the acute phase resolves, astragalus may be appropriate for recovery and immune rebuilding.
In TCM theory, astragalus is warm and yang-tonifying. In patients with yin deficiency heat patterns (night sweats, five-palm heat, dry mouth, red tongue with little coat), astragalus may exacerbate heat signs. This is a traditional energetic contraindication. Western herbalists may interpret this as caution in individuals with inflammatory conditions that are aggravated by warming herbs.
Due to the immunomodulatory and immune-enhancing properties of astragalus, theoretical caution is advised in patients with autoimmune conditions (rheumatoid arthritis, lupus, multiple sclerosis, etc.) where immune stimulation could potentially exacerbate the condition. However, the bidirectional immunomodulatory mechanism (enhancing underactive immunity while modulating overactive responses) means this is a theoretical rather than established contraindication. Some research actually suggests benefit in certain autoimmune conditions. Use under practitioner guidance.
Drug Interactions
| Drug / Class | Severity | Mechanism |
|---|---|---|
| Cyclophosphamide and other immunosuppressive chemotherapy agents (Immunosuppressive chemotherapy) | moderate | Astragalus enhances immune function (NK cell activity, white blood cell counts, cytokine production), which could theoretically oppose the immunosuppressive effects of chemotherapy. However, paradoxically, extensive Chinese clinical practice and multiple clinical studies use astragalus concurrently with cyclophosphamide and other chemotherapy agents specifically to protect white blood cell counts and reduce chemotherapy side effects. This represents a beneficial interaction in clinical practice rather than a harmful one. |
| Immunosuppressant medications (tacrolimus, cyclosporine, mycophenolate, azathioprine) (Immunosuppressants) | theoretical | Astragalus enhances multiple arms of immune function (innate and adaptive immunity). Theoretical opposition to the therapeutic goal of immunosuppressant medications used for organ transplant rejection prophylaxis or autoimmune disease management. The immune-stimulating polysaccharides and astragalosides could reduce the efficacy of pharmacological immunosuppression. |
| Lithium (Mood stabilizers) | theoretical | Astragalus has mild diuretic properties that could theoretically alter lithium clearance. Diuretics generally increase the risk of lithium toxicity by reducing renal lithium excretion and causing sodium depletion. However, the diuretic effect of astragalus is mild compared to pharmaceutical diuretics. |
| Anticoagulant and antiplatelet medications (warfarin, aspirin, clopidogrel) (Anticoagulants/antiplatelets) | theoretical | Some in vitro studies suggest astragalus constituents may have mild antiplatelet activity. Additive effects with anticoagulant or antiplatelet medications are theoretically possible. |
| Antidiabetic medications (metformin, sulfonylureas, insulin) (Hypoglycemic agents) | minor | Astragalus polysaccharides demonstrate hypoglycemic activity through improved insulin sensitivity and pancreatic beta-cell protection. Additive blood glucose lowering is possible when combined with pharmaceutical hypoglycemic agents. |
Pregnancy & Lactation
Pregnancy
insufficient data
Lactation
insufficient data
Astragalus has been used in traditional Chinese medicine during pregnancy as part of specific formulas prescribed by experienced practitioners, particularly in the later stages to strengthen the mother and prepare for labor. However, there are no controlled safety studies specifically evaluating astragalus in pregnant or lactating women. The WHO monograph does not specifically address pregnancy safety. In TCM practice, astragalus is not considered inherently harmful in pregnancy but is used judiciously and typically avoided in the first trimester without specific indication. The immunomodulatory properties and warming nature warrant caution. Conservative recommendation: avoid therapeutic doses during pregnancy and lactation unless prescribed by a qualified practitioner experienced in herbal medicine during pregnancy. Dietary-level consumption (as in soups and broths, a common Chinese practice) is generally considered safe.
Adverse Effects
References
Monograph Sources
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- [3] Hoffmann D. Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press, Rochester, VT (2003) . ISBN: 978-0892817498
- [4] Chen JK, Chen TT. Chinese Medical Herbology and Pharmacology. Art of Medicine Press, City of Industry, CA (2004) . ISBN: 978-0974063508
- [5] Chinese Pharmacopoeia Commission. Pharmacopoeia of the People's Republic of China, Volume 1: Astragali Radix (Huang qi). China Medical Science Press, Beijing (2020)
Clinical Studies
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- [7] Zhang L, Shergis JL, Yang L et al.. Astragalus membranaceus (Huang Qi) as adjunctive therapy for diabetic kidney disease: An updated systematic review and meta-analysis. J Ethnopharmacol (2019) ; 239 : 111921 . DOI: 10.1016/j.jep.2019.111921 . PMID: 31034954
- [8] Lin YQ, Yu F, Chen HJ et al.. Efficacy of astragalus combined with renin-angiotensin-aldosterone system blockers in the treatment of stage III diabetic nephropathy: a systematic review and meta-analysis. Renal Failure (2024) ; 46 : 2359033 . DOI: 10.1080/0886022X.2024.2359033 . PMID: 38836372
- [9] Sheng X, Yang L, Huang B et al.. Efficacy of Astragalus Membranaceus (Huang Qi) for Cancer-Related Fatigue: A Systematic Review and Meta-Analysis of Randomized Controlled Studies. Integr Cancer Ther (2025) ; 24 . DOI: 10.1177/15347354241313344 . PMID: 40302232
- [10] Zhang X, Wang J, Xiang S et al.. Astragaloside I from Astragalus membranaceus attenuates diabetic kidney disease. Am J Chin Med (2024) . DOI: 10.1142/S0192415X24500708 . PMID: 39347955
- [11] Josa E, Barril G, Ruperto M. Potential Effects of Bioactive Compounds of Plant-Based Foods and Medicinal Plants in Chronic Kidney Disease and Dialysis: A Systematic Review. Nutrients (2024) ; 16 : 4321 . DOI: 10.3390/nu16244321 . PMID: 39770942
Traditional Texts
- [12] Unknown (attributed to Shennong). Shennong Bencao Jing (Divine Farmer's Materia Medica Classic). Traditional Chinese text, compiled circa 200 CE from older oral traditions (200)
Pharmacopeias & Reviews
- [13] Fu J, Wang Z, Huang L et al.. Review of the botanical characteristics, phytochemistry, and pharmacology of Astragalus membranaceus (Huangqi). Phytother Res (2014) ; 28 : 1275-1283 . DOI: 10.1002/ptr.5188 . PMID: 25087616
- [14] Qi Y, Gao F, Hou L et al.. Anti-Inflammatory and Immunostimulatory Activities of Astragalosides. Am J Chin Med (2017) ; 45 : 1157-1167 . DOI: 10.1142/S0192415X1750063X . PMID: 28830214
- [15] Auyeung KK, Han QB, Ko JK. Astragalus membranaceus: A Review of its Protection Against Inflammation and Gastrointestinal Cancers. Am J Chin Med (2016) ; 44 : 1-22 . DOI: 10.1142/S0192415X16500014 . PMID: 26916911
- [16] Liu P, Zhao H, Luo Y. Anti-Aging Implications of Astragalus membranaceus (Huangqi): A Well-Known Chinese Tonic. Aging Dis (2017) ; 8 : 868-886 . DOI: 10.14336/AD.2017.0816 . PMID: 29344421
- [17] Sheik A, Kim K, Varaprasad GL et al.. The anti-cancerous activity of adaptogenic herb Astragalus membranaceus. Phytomedicine (2021) ; 91 : 153698 . DOI: 10.1016/j.phymed.2021.153698 . PMID: 34479785
- [18] Zhang Y, Chen Z, Chen L et al.. Astragali radix (Huangqi): a time-honored nourishing herbal medicine. Chin Med (2024) ; 19 : 119 . DOI: 10.1186/s13020-024-00977-z . PMID: 39215362
- [19] Liu YX, Song XM, Dan LW et al.. Astragali Radix: comprehensive review of its botany, phytochemistry, pharmacology and clinical application. Arch Pharm Res (2024) . DOI: 10.1007/s12272-024-01489-y . PMID: 38493280
- [20] Peng Y, Deng X, Yang SS et al.. Progress in Mechanism of Astragalus membranaceus and Its Chemical Constituents on Multiple Sclerosis. Chin J Integr Med (2023) . DOI: 10.1007/s11655-022-3535-6 . PMID: 35809178
- [21] Borowicz KK, Jach ME. Astragalus Membranaceus-Can It Delay Cellular Aging?. Nutrients (2025) ; 17 : 1299 . DOI: 10.3390/nu17081299 . PMID: 40284164
Last updated: 2026-03-01 | Status: published
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