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Astragalus is a flowering plant in the legume family whose root, known in traditional Chinese medicine as huang qi, is sold today as a dietary supplement promoted for immune support, stamina and many other uses. The short answer on evidence: the National Center for Complementary and Integrative Health (NCCIH) says there is not enough reliable scientific evidence to know whether astragalus is useful for any health condition. Here is what the root contains, what recent reviews found, the side effects and interactions that matter, and who should avoid it.
Peptide Labs sells one product whose label lists astragalus root as part of a branded blend, described below with label facts only. This article is general information, not medical advice.
Key Takeaways
- Astragalus root (huang qi) has been used for centuries in traditional Chinese medicine, usually with other herbs.
- NCCIH says there is not enough reliable evidence to know whether it helps any health condition.
- Recent reviews reported positive signals, but most of the studies were small or low quality.
- People with autoimmune diseases are advised to avoid it, and it may interact with immune-suppressing drugs.
- Safety in pregnancy and breastfeeding is not established.
What is astragalus?
The species used in supplements is Astragalus membranaceus, also listed as Astragalus mongholicus. Common names include milk vetch, huang qi and huang chi. According to Memorial Sloan Kettering Cancer Center (MSKCC), the root has a long history in traditional Chinese medicine as a tonic for stamina, strength and vitality, often combined with other herbs in a formula rather than used alone.
NCCIH describes astragalus as an adaptogen, a term for a natural substance theorized to help the body resist physical, environmental and emotional stress. That is a traditional concept, not a measured effect. Our guides to ginseng, ashwagandha and rhodiola cover other herbs sold under the same label.
What is in astragalus root?
MSKCC lists three main groups of compounds: polysaccharides (complex sugars), triterpenoid saponins such as the astragalosides, and flavonoids. Most of what is known about how these compounds act comes from cell and animal studies, which cannot show what happens in people taking a capsule.
Astragalus benefits: what the research shows
Astragalus is marketed for colds, allergies, fatigue, blood sugar, kidney health and immune function. NCCIH summarized three recent reviews, shown below. The findings are research summaries, not proof that astragalus works for any condition, and nobody should change a prescribed medicine because of them.
| Review (per NCCIH) | Who and what was studied | Reported finding | Main limitation |
|---|---|---|---|
| 2024, 20 studies | 953 adults with type 2 diabetes taking metformin | Astragalus plus metformin lowered fasting glucose and HbA1c more than metformin alone | Most studies low quality with bias |
| 2023, 19 studies | 1,094 participants, immune markers | Stronger immune responses and lower inflammatory cytokines | Small, varied studies |
| 2023, 50 studies | 3,423 people with a kidney disorder (membranous nephropathy) | Added to standard care, some kidney markers improved more | Low quality, small, limited geography |
Two patterns stand out. First, many trials tested astragalus inside multi-herb formulas or as an add-on to standard medical care, so the effect of the root alone is hard to separate. Second, MSKCC notes that many studies were done with injectable astragalus products used in China, and whether oral supplements have similar effects is not known. MSKCC also reports that many studies in the meta-analyses it reviewed had poor methodology and that larger, well-designed trials are needed.
Immune and energy claims
Immune claims rest mainly on lab studies of the polysaccharides and on small human studies measuring blood markers, not on trials showing fewer infections. In one small study of healthy people, MSKCC reports, an astragalus root extract raised immune cell counts and caused short-lived fatigue, malaise and headache, similar to a mild viral-type response. A changed lab value is not the same as a health benefit. For another herb promoted for immune support, see our elderberry guide.
Blood sugar
The diabetes review is the most cited result, but every participant was already taking metformin, and the studies were judged low quality. If you have diabetes, talk to your clinician before adding any herb that may affect glucose, especially alongside other products marketed for blood sugar such as berberine.
Astragalus side effects and drug interactions
NCCIH says astragalus may be safe when taken by mouth, but a thorough safety evaluation has not been done, and there is not enough information on applying it to the skin. MSKCC lists fatigue, malaise, headache and lower blood pressure as reported astragalus side effects. The bigger issues are who should avoid it and what it may interact with.
- Autoimmune diseases: NCCIH advises people with autoimmune diseases to avoid astragalus because it might worsen symptoms.
- Immune-suppressing medicines: astragalus may interact with drugs that suppress the immune system, such as those used after an organ transplant. MSKCC describes a patient whose tacrolimus level fell by nearly half while taking herbal granules that contained astragalus.
- Blood thinners: MSKCC notes anticoagulant properties in lab research that may raise bleeding risk with medicines such as warfarin; the clinical significance is unknown.
- Blood pressure medicines and water pills: astragalus may lower blood pressure and increase sodium loss in urine, so effects could add up.
- Hormone therapy and chemotherapy: lab studies found estrogen-like and drug-transport effects of unknown relevance; anyone in cancer care should ask their oncology team first.
- Pregnancy and breastfeeding: little is known, and NCCIH notes some animal research suggesting toxicity to the fetus.
Tell your doctor and pharmacist about any herbal product, and stop and seek care if you notice unusual bleeding, dizziness or a rash.
Astragalus root supplements: reading the label
Astragalus is sold as dried root, powders, capsules, liquid extracts and teas, and it often appears as one ingredient among many. Dietary supplements are not approved by the FDA before they are sold, so check whether the label names the species and plant part, whether the amount is disclosed or hidden in a proprietary blend, and whether the product carries an independent testing seal; our guide to third-party tested supplements explains the seals.
The product we carry is Primal Queen PQ7, a capsule formula whose label lists AstraGin, a branded blend of Panax notoginseng root and Astragalus membranaceus root, alongside chromium, saffron, dihydroberberine, bovine colostrum and other ingredients. Per the label it contains milk, uses gelatin capsules, is for healthy adults 18 and older, and pregnant or nursing women should consult a physician first. Astragalus is a minor part of that formula, so it is not a way to study astragalus on its own. For the B vitamins found in many similar formulas, see our vitamin B complex guide.
Frequently Asked Questions
What is astragalus used for?
It is used in traditional Chinese medicine as a tonic and is promoted for immune support, fatigue, allergies and blood sugar. NCCIH says the evidence is not strong enough to know whether it helps any condition.
Is astragalus the same as huang qi?
Yes. Huang qi is the Chinese name for the root of Astragalus membranaceus, also called milk vetch.
What are the main astragalus side effects?
Reported effects include fatigue, malaise, headache and lower blood pressure. A thorough safety evaluation has not been done.
Who should not take astragalus?
People with autoimmune diseases, people taking immune-suppressing medicines and anyone pregnant or breastfeeding should avoid it unless a clinician advises otherwise.
Does astragalus interact with medications?
It may interact with immunosuppressants, and lab research raises questions about blood thinners, blood pressure medicines, diuretics and some cancer drugs. Ask your pharmacist.
Does astragalus boost the immune system?
Small studies show changes in immune markers, but no good trials show it reduces infections in healthy people.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines or are pregnant. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Reishi Mushroom Benefits: Evidence, Liver Safety and Warfarin, Echinacea: Benefits, Cold Research, Side Effects and Labels, Ginseng Benefits: Panax vs American Ginseng, Evidence and Side Effects.