⚠ Evidence warning: Clinical trials or other evidence do not support the claims that astragalus reduces the frequency, severity and duration of upper respiratory infections and that it reduces proteinuria, improves kidney filtration and slows kidney damage. This page keeps it as a report of what people, websites or other media say.

Astragalus (Astragalus membranaceus)

Astragalus — scientific infographic poster
Astragalus (Astragalus membranaceus) Astragalus membranaceus whole-plant botanical illustration

Table of Contents

  1. Traditional Use in Chinese Medicine
  2. Active Compounds
  3. Immune System Support
  4. Cardiovascular Protection
  5. Kidney Function and Diabetic Nephropathy
  6. Fatigue, Stamina, and Adaptogenic Action
  7. Telomerase Activation and Longevity Research
  8. Forms and Preparations
  9. Doses in Traditional Use and Studies
  10. Cautions and Contraindications
  11. Featured Videos

Traditional Use in Chinese Medicine

Astragalus (huang qi, 黄耀, "yellow leader") is one of the most respected tonic herbs in Traditional Chinese Medicine, first recorded around two thousand years ago and ranked among the "superior" herbs taken long-term to fortify the body's qi (vital energy), strengthen the lungs and spleen, and bolster its defences. It is the chief or signature herb in famous classical formulas such as Yu Ping Feng San (Jade Windscreen Powder) and Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction), and reached Western herbalism only in recent decades — the fuller story is told in the dedicated History & Traditional Use article.

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Active Compounds

Astragalus root contains more than one hundred identified bioactive constituents. The most pharmacologically significant fall into three main categories:

The synergy among these constituents produces astragalus's broad therapeutic profile. Standardized extracts typically report polysaccharide content (for immune indications) or astragaloside IV content (for cardiovascular indications).

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Immune System Support

Astragalus is one of the most thoroughly characterized immunomodulators in the herbal pharmacopoeia. Unlike echinacea, which is typically used short-term for acute infection, astragalus is traditionally taken over weeks to months with the aim of building sustained immune resilience. In traditional and practitioner use it is taken by people with frequent infections, chronic immune suppression, or seasonal vulnerability.

Documented immunological effects include:

In China, Traditional Chinese Medicine practitioners use astragalus to reduce the risk of respiratory infections, but the placebo-controlled evidence is thin. For children, a 2016 Cochrane review found no randomised trial comparing oral astragalus alone with placebo for preventing frequent respiratory infections — 44 otherwise eligible studies were excluded because they had no placebo group — and concluded that there was insufficient evidence to assess its effectiveness and safety (Su 2016). Multiple clinical trials have shown that astragalus supplementation reduces the frequency, severity, and duration of upper respiratory infections in adults and children. In integrative oncology, it is one of the most-studied adjuvants for restoring immune function during and after conventional cancer treatment.

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Cardiovascular Protection

Astragaloside IV, the most clinically researched saponin, has demonstrated significant cardioprotective activity. Mechanisms include reduced cardiac fibrosis, improved myocardial contractility, protection against ischemia-reperfusion injury, and modulation of mitochondrial function in heart muscle cells.

In congestive heart failure, controlled trials in China have shown that astragalus injection added to standard therapy improves left ventricular ejection fraction, exercise tolerance, and quality of life. Oral preparations are commonly used in integrative cardiology for their gentler, longer-acting support.

Additional cardiovascular benefits documented in the literature:

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Kidney Function and Diabetic Nephropathy

One of the strongest evidence bases for astragalus is in the treatment of chronic kidney disease, particularly diabetic nephropathy. Multiple meta-analyses of controlled trials — mostly conducted in China — have shown that astragalus, alone or combined with conventional treatment, can reduce proteinuria, improve glomerular filtration rate, and slow the progression of kidney damage.

Astragalus is one of the herbs most widely used in traditional Chinese medicine for kidney disease. A 2014 Cochrane review of 22 trials with 1,323 participants found that, as an add-on to conventional treatment, it showed some promising effects in reducing proteinuria and raising haemoglobin and serum albumin. But study quality was low overall, results on kidney function were inconsistent, and none of the trials reported time to dialysis or deaths; the reviewers concluded that definitive conclusions could not be made (Zhang 2014).

Proposed mechanisms include reduction of TGF-beta-mediated kidney fibrosis, protection of podocyte (filtration cell) integrity, and improvement of renal microcirculation. Astragalus also appears to reduce oxidative stress in kidney tissue and modulate inflammatory cytokines that contribute to diabetic nephropathy progression.

Decisions about herbal therapy in chronic kidney disease belong with the clinician managing the kidney disease; the Cochrane reviewers judged the existing trials too low in quality for definitive conclusions.

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Fatigue, Stamina, and Adaptogenic Action

Although classically a qi tonic rather than an adaptogen in the Russian sense, astragalus shares many properties with classical adaptogens like Rhodiola and Eleuthero. It is traditionally used to support recovery from physical exertion, stamina, and fatigue in chronically depleted individuals.

Naturopathic clinicians frequently use astragalus for patients presenting with post-viral fatigue, recovery from major surgery, chronic stress with poor sleep, and the fatigue that accompanies autoimmune conditions in remission. Practitioners describe the effects as gradual, accumulating over six to twelve weeks of consistent use, and use it mainly for chronic rather than acute presentations.

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Telomerase Activation and Longevity Research

Cycloastragenol, an aglycone derived from astragaloside IV, has attracted research attention for its ability to activate telomerase, the enzyme that maintains the protective end caps (telomeres) on chromosomes. Telomere shortening is a recognized hallmark of cellular aging, and pharmacological telomerase activators are an active area of investigation in geroscience.

Commercial cycloastragenol-containing telomerase-activator products are sold for this purpose. Small clinical studies of such a product have reported modest telomere changes and improvements in immune cell markers in older adults: in a 2011 report from a commercial health-maintenance program, mean telomere length did not increase but the share of short telomeres fell, as did the proportion of senescent cytotoxic T cells (Harley 2011), and in a 2016 placebo-controlled trial of 117 adults aged 53–87 the lower dose lengthened telomeres while the higher dose did not reach statistical significance (Salvador 2016). Large-scale trials are limited and long-term safety remains under study. The longevity claims are preliminary, though the underlying biology is scientifically credible.

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Forms and Preparations

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Doses in Traditional Use and Studies

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Cautions and Contraindications

Astragalus is one of the safest medicinal herbs, with an extensive traditional record and a favorable modern safety profile. Important considerations include:

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Key Research Papers

The papers cited on this page are listed first, followed by PubMed search links that provide curated entry points into the published clinical and mechanistic literature on Astragalus (Astragalus membranaceus). Each link opens directly in PubMed at the National Library of Medicine.

  1. Su G, Chen X, Liu Z, Yang L, Zhang L, Stålsby Lundborg C, Wen Z, Guo X, Qin X, Liang J, Liu X. Oral Astragalus (Huang qi) for preventing frequent episodes of acute respiratory tract infection in children. Cochrane Database Syst Rev. 2016;12(12):CD011958 — PubMed PMID: 27905672
  2. Zhang HW, Lin ZX, Xu C, Leung C, Chan LS. Astragalus (a traditional Chinese medicine) for treating chronic kidney disease. Cochrane Database Syst Rev. 2014;2014(10):CD008369 — PubMed PMID: 25335553
  3. Harley CB, Liu W, Blasco M, Vera E, Andrews WH, Briggs LA, Raffaele JM. A natural product telomerase activator as part of a health maintenance program. Rejuvenation Res. 2011;14(1):45-56 — PubMed PMID: 20822369
  4. Salvador L, Singaravelu G, Harley CB, Flom P, Suram A, Raffaele JM. A natural product telomerase activator lengthens telomeres in humans: a randomized, double blind, and placebo controlled study. Rejuvenation Res. 2016;19(6):478-484 — PubMed PMID: 26950204
  5. Astragalus polysaccharides and immune modulation — PubMed: astragalus polysaccharides immune
  6. Astragaloside IV in cardiovascular disease — PubMed: astragaloside IV cardiovascular
  7. Astragalus and chronic fatigue — PubMed: astragalus fatigue
  8. Astragalus as adjuvant in chemotherapy — PubMed: astragalus chemotherapy adjuvant
  9. Astragalus for kidney function and proteinuria — PubMed: astragalus kidney proteinuria
  10. Astragalus and respiratory infection — PubMed: astragalus respiratory infection
  11. Astragalus and longevity / telomerase activation — PubMed: astragalus telomerase
  12. Astragalus safety and adverse events — PubMed: astragalus safety

External Authoritative Resources

  1. NCCIH — Herbs at a Glance
  2. MedlinePlus — Herbs and Supplements
  3. PubMed — All research on Astragalus membranaceus

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Connections

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