Mother Tincture
Mother tincture of Astragalus membranaceus root, used in traditional phytotherapeutic practice.
Tincture
Chinese Pharmacopoeia · WHO Monograph
Biological Overview
Astragalus membranaceus is a perennial legume of the Fabaceae family, growing wild along riverbanks, estuaries and pine forests across China, North Korea (where it is also cultivated), Mongolia and Siberia. Its root, harvested from plants four to seven years old, is a foundational tonic herb in traditional Chinese medicine. Commercial root can be adulterated by other, less potent species lower in isoflavones and astragalosides.
FamilyFabaceae
Root Age4–7 years
AstragalosidesI–X + isoforms
Key AglyconeCycloastragenol
Botanical Classification
Taxonomy & Identification
- Latin Name
- Astragalus membranaceus (Fisch.) Bge.
- Synonyms
- A. membranaceus var. mongholicus, A. mongholicus Bge.
- Family
- Fabaceae
- Common Names
- Astragalus, Huang Qi, Huangqi, Hwanggi, Radix Astragali
- Parts Used
- Root (4–7 year old plant)
- Origin
- China, North Korea, Mongolia, Siberia
⚠ Adulteration Risk
Astragalus membranaceus and A. membranaceus var. mongholicus can be adulterated by other, related species that are considerably lower in isoflavones and astragalosides — the compounds responsible for most documented pharmacological activity. [1]
Ethnobotany & Traditional Use
History & Tradition
Astragalus root, Huang Qi, is one of the most widely used tonic herbs in traditional Chinese medicine, employed to prevent weakening in the ill, protect against infection, and increase endurance. The Chinese Pharmacopoeia lists both Astragalus membranaceus var. mongholicus and Astragalus membranaceus for treating "deficiencies of Qi." [2]
Traditionally, it has been used preventively against respiratory infections, nephritis, uterine bleeding, diabetes mellitus, chronic bronchitis, urinary retention, leprosy and the after-effects of stroke, and it is also used in Kampo, traditional Japanese medicine. [3]
Modern research has since documented anti-inflammatory, immunostimulant, antioxidant, anti-cancer, antidiabetic, cardioprotective, hepatoprotective and antiviral effects consistent with this long traditional use. [2]
The Key Molecule
Astragalosides & Cycloastragenol — Deep Dive
Ten numbered astragalosides and their isoforms anchor astragalus's pharmacology — with astragaloside IV and its aglycone, cycloastragenol, the most extensively studied.
🧬
Deglycosylation to Cycloastragenol
Astragaloside IV is transformed by deglycosylation in the gastrointestinal tract into cycloastragenol, its aglycone and the form most linked to telomerase-activating effects. [83]
⏳
🛡️
Lymphocyte Proliferation Support
Astragaloside IV and cycloastragenol have demonstrated improved proliferative response of CD8+ T lymphocytes. [17]
🧠
Neuronal Telomerase Activity
Cycloastragenol activates telomerase in neuronal cells, a mechanism explored for potential relevance to mood and neurodegeneration research. [56]
⚠ Standardization Matters
Astragaloside and polysaccharide content varies widely between preparations
Most documented pharmacological research uses standardized extracts or isolated compounds (astragaloside IV, cycloastragenol, Astragalus polysaccharides) with known concentrations — not unstandardized root powder or decoctions of unknown potency, which can also be diluted by adulterant species lower in these compounds. [1]
Pharmaceutical Preparations
Parts Used & Available Forms
The root, harvested from a plant four to seven years old, is available across traditional and standardized preparations.
Standardized Fresh Plant Extract
Standardized fresh plant extract (EPS) of astragalus root, a concentrated liquid extract preparation.
Fresh Plant Extract
Powder & Dry Extract
Root powder and standardized dry extract, alongside numerous commercial finished products.
Powder · Dry Extract
Clinical Dosimetry
Dosages
Traditional dosing of root powder and dry extract, per the primary source and the Chinese Pharmacopoeia.
Phytochemistry
Composition
Documented phytochemistry of the root, the sole part with a described composition in the primary source.
PolysaccharidesAstragalus polysaccharides (APS, α-(1→4)-D-glucan) A, B, C & D; astragalan; astraglucan AMem-P
Present
Triterpenoid SaponinsAstragalosides I–X (Astragalus Saponin/ASP), isoastragalosides I–IV, cycloastragenol (aglycone of astragaloside IV)
Present
FlavonoidsCalycosin (calycoside), formononetin (metabolized to daidzein), astragalin (kaempferol 3-O-β-glucoside), ononin
Present
Amino Acids & GABAFree amino acid fraction and gamma-aminobutyric acid
Present
LignansLariciresinol, syringaresinol
Present
SterolsSitosterol, daucosterol
Present
LectinsDocumented lectin fraction
Present
Trace ElementsIron, zinc, copper, magnesium, manganese, cobalt, calcium, potassium
Present
🌱
Adaptogenic & Multi-System Support
Broad documented profile spanning immunomodulant, antitumor, antiviral, antidiabetic and anti-aging activity, attributed to polysaccharides, triterpenes and flavonoids. [12][14]
🦠
Immunostimulant
Stimulates nitric oxide production in macrophages, activates B cells and macrophages without activating T cells, and increases Natural Killer cell cytotoxicity. [18][20]
⚖️
Immunomodulant in Autoimmunity
Reduces inflammatory response and demyelination in experimental autoimmune encephalomyelitis, and moderates cytokine imbalance in autoimmune myocarditis and rheumatoid arthritis models. [29][33]
🧬
Antitumor & Chemo-Adjunct
Induces apoptosis in colon cancer and hepatocarcinoma cell lines, improves tolerance to chemotherapy, and may reduce multidrug resistance via P-glycoprotein action. [36][41]
🩸
Antidiabetic Potential
Inhibits alpha-glucosidase activity, among other documented antidiabetic mechanisms. [47]
❤️
Anti-inflammatory & Anti-atherosclerotic
Reduces inflammation and atherosclerosis progression via downregulation of vascular adhesion molecules. [48]
⏳
Telomerase Activation
Astragaloside IV and cycloastragenol activate telomerase, with a randomized, double-blind, placebo-controlled human trial documenting telomere lengthening in leukocytes over one year. [51][59]
🧪
Antioxidant & Organ Protection
Protects heart, brain, kidney, intestine, liver and lung tissue, and scavenges hydroxyl radical and hydrogen peroxide. [61][62]
🫀
Cardiovascular & Vascular Protection
Improves metabolic syndrome markers and protects the vascular endothelium. [63][64]
🧠
Neuroprotective
Protects dopaminergic neurons with potential relevance to Parkinson's disease, and reduces cognitive deficits and brain iron overload in Alzheimer's disease models. [66][70]
🌬️
Anti-allergic & Anti-asthmatic
Prevents airway hyperreactivity, likely via inhibition of Th2 cytokines and TGF-β1. [71][74]
🦴
Renal Protection & Gut Microbiota
A root polysaccharide shows renal protective effects, and the root helps rebalance intestinal flora in aged mice. [65][76]
Clinical Applications
Clinical Indications
Traditional and researched uses for the whole plant, including areas the primary source itself flags as preliminary or uncertain.
🦠
Immune & Infection Prevention
Recurrent & Respiratory Infections
- Recurrent infections: documented traditional indication for the whole plant.
- Common cold prevention & treatment: a 1,000-subject trial found oral or pernasal extract reduced cold incidence and duration, with increased nasal IgA and IgG. [3]
🫁
Respiratory
Airway Conditions
- Asthma: documented traditional and researched indication.
🩺
Renal
Kidney Conditions
- Glomerulonephritis & IgA nephropathy: documented researched indication. [78]
❔
Investigational
Flagged Uncertain in Primary Source
- Athletic performance: documented traditional indication for improved sports performance.
- Lupus, cancers (colon, gastric, non-small-cell lung), anticancer adjunct, aging prevention, Alzheimer's disease: all explicitly marked as uncertain ("?") in the primary source itself — preliminary, not established, indications. [79][82]
Pharmacodynamics
Mode of Action
The documented mechanisms behind astragalus's immune, telomerase and antioxidant effects.
🔬
Intestinal Absorption & Hepatic Metabolism
Cycloastragenol is well absorbed by the intestinal epithelium, but first-pass hepatic metabolism limits its oral bioavailability; elimination is biliary, fecal and renal, with an enterohepatic cycle documented in rats. [83]
🧬
🦠
🧪
Free Radical Scavenging
Astragalosides, flavonoids and polysaccharides act as antioxidants, scavenging the hydroxyl radical and hydrogen peroxide to protect multiple organ systems. [62]
Clinical Safety
Safety, Interactions & Precautions
Documented contraindications, drug interactions and precautions for root preparations.
⚠ Absolute Contraindication
Avoid With Immunosuppressive Therapy & Hematopoietic Cancers
Because astragalus stimulates immune activity and hematopoiesis, it should be avoided by people on immunosuppressive therapy and by people with hematopoietic cancers, where stimulating blood cell production could be counterproductive or harmful. This is a documented precaution in the primary source, not a theoretical one.
Adverse Effects
- Mild gastrointestinal disturbance: possible diarrhea has been documented.
- Mild allergic reactions: possible in those allergic to Fabaceae family plants.
- Increased diuresis: possible increase in urine output.
- High-dose animal data: no adverse effects observed in mice after oral doses up to 100 g/kg. [3]
Contraindications & Drug Interactions
- CYP1A2 inhibition: astragaloside IV is a potent CYP1A2 inhibitor in rat in vitro and in vivo studies. [84]
- UGT-metabolized drugs: possible interaction with medications metabolized by UDP-glucuronosyltransferases (mainly UGT1A8 or UGT2B7) at sufficient plasma concentrations. [85]
- Pregnancy & breastfeeding: not recommended.
Clinical Disclaimer: This monograph is for educational and professional reference only. It does not constitute medical advice, diagnosis, or treatment guidance. Always consult a qualified healthcare provider before initiating any phytotherapeutic regimen, particularly if you are taking prescription medications, are pregnant, or have existing health conditions.
Common Questions
Frequently Asked Questions
What is astragalus traditionally used for?
Astragalus root (Huang Qi) is widely used in traditional Chinese medicine as a tonic, to prevent weakening in the ill, protect against infection, and increase endurance. The Chinese Pharmacopoeia lists it for treating "Qi deficiencies," and it has also long been used in Kampo, traditional Japanese medicine.
Which part of the astragalus plant is used medicinally?
The root, harvested from a plant that is four to seven years old, is the part used medicinally.
What are astragalosides and why do they matter?
Astragalosides are triterpenoid saponins (numbered I through X) considered central to astragalus's pharmacology. Astragaloside IV is converted in the gastrointestinal tract into cycloastragenol, its aglycone, which has been specifically studied for telomerase-activating effects.
Can astragalus really activate telomerase and support healthy aging?
There is real human trial evidence: a randomized, double-blind, placebo-controlled study found that a cycloastragenol-based extract (TA-65), taken in discontinuous courses over one year by older adults, increased telomere length in leukocytes. Preclinical research also shows astragaloside IV and cycloastragenol activate telomerase and increase average telomere length.
Does astragalus boost the immune system?
Yes. Astragalus is a well-documented immunostimulant and immunomodulant: it stimulates nitric oxide production in macrophages, activates B cells and macrophages, and increases the cytotoxicity of Natural Killer cells, without activating T cells directly.
Can astragalus help prevent the common cold?
In a trial involving 1,000 human subjects, oral or pernasal administration of an aqueous Astragalus membranaceus extract decreased the incidence of the common cold and shortened its course, while considerably increasing IgA and IgG levels in nasal secretions.
Is astragalus safe to take with other medications?
Not necessarily without caution. Astragaloside IV is a potent inhibitor of the CYP1A2 enzyme in animal studies, and astragalus may interact with medications metabolized by UDP-glucuronosyltransferases (mainly UGT1A8 or UGT2B7) at sufficient plasma concentrations. Always discuss astragalus use with a healthcare provider if you take prescription medication.
Who should avoid astragalus?
Astragalus is not recommended during pregnancy or breastfeeding. It should also be avoided by people on immunosuppressive therapy and by people with hematopoietic cancers, because astragalus stimulates hematopoiesis and immune activity.
Primary Literature
Bibliography
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