Astragalus: Health Benefits, Dosing, Side Effects
ASTRAGALUS:
HEALTH BENEFITS, APPROPRIATE DOSE, SIDE EFFECTS
Astragalus
INTRODUCTION
Astragalus has been consumed in Asia for more than 2,000 years for heart health, autoimmune and allergic diseases, boosting the immune system, and for cancer treatment or in conjunction with chemotherapy. It can be prepared and consumed as a tea, in soups, liquid tinctures, capsules, and sometimes intravenously (in certain hospitals).
Astragalus membranaceus (known as Huang Qi) is a plant belonging to the Luguminosae family. The active ingredient is Astragalus membranaceus (the same name as the plant) and it comes from the root of the plant. When it comes to disease prevention, and possibly treating various diseases, it checks multiple boxes for maintaining health with the following properties observed either in scientific studies or anectodatally :
- Anti-diabetes
- Anit-inflammatory
- Anti-oxidant
- Anti-cancer
- Anti-viral
- Cardioprotective
- Diabetic nephropathy (complication of diabetes mellitus reference: https://pmc.ncbi.nlm.nih.gov/articles/PMC11155431/)
- hepatoprotective
- Neuroprotective
- Immune regulation/immunostimulation
The active ingredients of Astragalus are saponins polysaccharides, and astragaloside IV (AS-IV) which are known to affect immune system activity to help in preventing chronic diseases. These actives make it one of the most frequently used cancer-fighting herbs, diabetes-fighting herbs and heart disease-fighting herbs in alternative medicine.
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- Learn about the foods that prevent cancer in our articles 10 Foods that Prevent Cancer and 6 Foods for Cancer Prevention
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Now back to the article…
TRADITIONAL USES
Astragalus has been traditionally used in formulations with other herbs and in some more acclaimed Chinese medicine products such as Yupinfeng granule and Wui Baifeng pill [1]. As previously mentioned, it is known as Huangqi in Traditional Chinese Medicine (TCM) and Radix Astragali in Latin [2]. Traditional Chinese medicine states that astragalus improves chi, sore support and benefits water in the body.
CLINICAL STUDIES
The disease prevention and disease-fighting potential of Astragalus has been documented and there is science-based evidence on its potential. For instance, clinical studies in China have shown good efficacy in treating allergic diseases in children with asthma [1]. Additional studies on its effect as a cancer-fighting herb and in other diseases are published. Here’s a small sampling of its potential in chronic diseases:
- Diabetes and Astragalus [7]:
- Type 1 and 2 diabetes create microvascular defects throughout the body but particularly in the kidneys that can result in kidney disease (i.e., diabetic retinopathy).
- This kidney disease has the signs and symptoms of edema (swelling), protein in the urine, and protein and nitrogenous products in the blood.
- Typical treatment includes prescription medications like renin-angiotensin-aldosterone system blockers (RAAS), angiotensin-converting enzyme (ACE) inhibitors (e.g., benazepril), and angiotensin receptor blockers (ARBs) which block RAAS to rescue urinary protein levels and control blood pressure.
- A meta-analysis examined the effects of Astragalus in combination with prescription medications and compared it to standard prescription medication alone:
- Out of 19 studies included, the urinary protein excretion rate (UPER) was reported in 1436 participants at baseline (721 in the combo treatment group and 735 in the control group) and then post-treatment (treatment lasted for 3 or more weeks).
- The weighted mean difference was -24.76 for Astragalus + RAAS blocker group compared to RAAS blocker group alone.
- The UPER significantly decreased in participants receiving Astragalus + RAAS blocker compared to participants receiving RAAS blocker alone (bias using GRADE evaluation was measured by the researchers and the results were shown that these results were “high quality”).
- Restored graft versus host reaction in cancer patients when compared to healthy controls (n=20). It restored immune system response which exceeded some of the controls after administration of the drug, which helps show its potential as an herb that can fight cancer.
- Non-Small Cell Lung Cancer [10]:
- Lung cancer is the leading cause of death worldwide with non-small cell lung cancer being the most frequently diagnosed type. Often radical surgery cannot be performed on these patients due to the advanced stage of the disease upon diagnosis.
- Standard lung cancer treatment includes platinum-based chemotherapy, however, its efficacy is often dampened by the advanced stage of the disease and the many side effects of the drug.
- A meta-analysis examined the effects of Astragalus in combination with platinum-based chemotherapy vs. patients who only received platinum-based chemotherapy:
- Of the 19 clinical trials reviewed, there were 831 patients in the Astragalus + chemo group that showed a significant tumor response (RR: 1.19) and a 48% reduction in bone marrow toxicity as compared to the patients that received chemo alone (n=802)
- Systemic lupus erythematosus (SLE) lowered patients’ natural killer cell activity when given astragalus extract (n=28)
- Radiation-induced lung injury, Astragalus (formulated with other herbs) improved the incidence of radiation-induced lung injury in over 1000 patients. It also improved lung injury and reduced inflammatory factors [3, 4]
- DISCLAIMER: Reporting bias has been noted in clinical trials from China that examined Traditional Chinese Medicine herbs like Astragalus. (see reference 8 below). The data quality for these trials are often reported as low quality due to lack of control during randomization, too few patients in these trials and other reporting biases. This information is intended for educational purposes only and you should consult with your healthcare provider and a licensed herbalist for additional information on this herb.
SAFETY
Astragalus membranaceus has demonstrated low side effects and toxicity in human and animal studies. However, those taking hypotensives and antihypertensive medications should avoid large doses of the herb [5].
The NIH’s National Institute for Complementary and Integrative Health notes that astragalus is safe when used conventionally, which is oral supplementation [9]. Reports of safe use for up to 4 months at 60 mg a day have been reported. They report “side effects with oral use can be rash, itching, nasal symptoms, and stomach issues though uncommon.” [9]
Women who are pregnant or breastfeeding should use extreme caution with using this herb as animal studies have shown toxicity in pregnant mice [9].
Several studies have specifically looked at safety in various patient types. For example, in patients with solid tumors, doses of 4600 mg and 9800 mg of astragalus were administered with mild adverse reactions of dizziness and nausea [6].
DOSE
Astragalus dosage for adults will depend on the form of the herb (e.g., root, liquid tincture), the person’s health condition, intended use and your age.
General Guidelines:
Capsules
The cancer-fighting herb of Astragalus can be found in capsule form, with safe doses ranging from 250 mg to 1,000 mg a day. It is best to divide the dose into 2 – 3 doses per day.
Tincture or Liquid Extracts
A common way to consume this cancer-fighting herb is to ingest many drops of an astragalus tincture. The astragalus dose can vary depending on how the liquid tincture is prepared, however, it is recommended to take between 40 – 80 drops of liquid tincture/extract of a 1:5 tincture, 2 – 3 times a day.
Tea
You can use astragalus as a cancer-fighting tea alone or with other herbs. Simmer 3 – 6 grams of dried astragalus root in hot water for 30 minutes to 1 hour and you’ll have a nice tea to sip on throughout the day.
Food (soups, decoctions)
Astragalus can be eaten and is considered in a group of foods that fight cancer. Consuming between 1 – 15 grams of dried astragalus root a day is safe for most adults.
DISCLAIMER
The information in this article are for educational purposes and is not meant to treat, diagnose or prescribe medications or herbs. For questions on the information contained in this article, please consult with your healthcare provider. Reporting bias has been noted in clinical trials from China that examined Traditional Chinese Medicine herbs like Astragalus. (see reference 8 below). The data quality for these trials are often reported as low quality due to lack of control during randomization, too few patients in these trials and other reporting biases. This information is intended for educational purposes only and you should consult with your healthcare provider and a licensed herbalist for additional information on this herb.
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REFERENCES
[1] Yu S, Pen W, Qiu F, Zhang G: https://www.sciencedirect.com/science/article/pii/S0753332222013786?via%3Dihub).[2] https://pmc.ncbi.nlm.nih.gov/articles/PMC7167792/
[3] https://pmc.ncbi.nlm.nih.gov/articles/PMC10980465/ [4] https://journals.sagepub.com/doi/epdf/10.1177/1534735403256419 [5] https://journals.sagepub.com/doi/epdf/10.1177/1534735403256419 [6] https://pubmed.ncbi.nlm.nih.gov/39469996/ [7] https://pmc.ncbi.nlm.nih.gov/articles/PMC11155431/ [8] https://pubmed.ncbi.nlm.nih.gov/23864210/ [9] https://www.nccih.nih.gov/health/astragalus [10] https://pmc.ncbi.nlm.nih.gov/articles/PMC6426520/