TCM and "Immune Support": Claims and What Is Known
What research does and does not show about astragalus and Chinese herbal formulas marketed for immune support, including blood-marker studies, a children's formula review, and cautions for autoimmune disease.
Content last updated . This page has not been medically reviewed.
What this page is for
Many Chinese herbal products are sold with "immune support" or "strengthens defenses" language. This page checks those claims against what researchers measured. It does not say any herb makes your immune system stronger, because none of the research we read shows that. A change in a lab marker is not the same as fewer infections. See How the Immune System Works and, for the well-documented ways to lower infection risk, Vaccines and Infection Prevention.This page is information only. It does not suggest skipping vaccines or stopping any medicine.
How TCM frames it
In traditional Chinese medicine, ideas such as "protecting the exterior" or "strengthening qi" belong to traditional frameworks of patterns, not to immunology. See Qi, Yin and Yang, Five Phases and Meridians as Traditional Concepts. Astragalus (Huang Qi), the herb most often linked to immune claims, is described by the National Center for Complementary and Integrative Health (NCCIH) as a root used for centuries in traditional Chinese medicine, often in combination with other herbs, and as theorized to be an "adaptogen". [1] For the herb profile, see Astragalus (Huang Qi) in Chinese Medicine.What research found
| Question | What the source found | Strength of evidence |
|---|---|---|
| Does astragalus change immune lab markers? | A 2023 meta-analysis of 19 human studies (1,094 participants) found lower levels of several inflammatory signaling proteins (cytokines) and higher levels of some immune cell markers (CD3, CD4/CD8 ratio) after astragalus, with substantial differences between studies. [2] NCCIH notes the studies were small and varied in how they were done. [1] | Promising but limited (lab markers only) |
| Does astragalus prevent infections in healthy adults? | NCCIH states there is not sufficient reliable scientific evidence to know whether astragalus is useful for any health condition. [1] We did not find a trial we could read showing it prevents colds or flu in healthy adults: proper evidence not found (we checked NCCIH and PubMed for astragalus and Chinese herbal formulas with infection prevention outcomes). | Insufficient evidence |
| A Chinese herbal formula (Yupingfeng granules) added to usual care in children with recurrent respiratory infections | A 2022 review of 17 trials found a higher total clinical response rate (risk ratio 1.18) and higher immunoglobulin levels (IgA, IgM and IgG) than in the control groups, and the authors said effectiveness and safety remain to be further verified. [3] | Promising but limited |
| Chinese herbal medicine for acute upper respiratory infections | A review reported that most clinical trials indicated shorter courses and relief of symptoms such as fever and cough, while noting more reliable evidence is needed for pregnant women. [4] | Promising but limited |
For colds and flu specifically, see TCM for Colds and Flu.
Reading these results carefully
- A change in a blood marker is a physiological finding, not a clinical outcome. Fewer infections, fewer days sick, and fewer hospital visits are the outcomes that matter; the astragalus meta-analysis did not measure those. [2]
- In the children's formula review, the studies tested the formula as an add-on to conventional care, not as a replacement. [3]
- Several reviews note limits in study quality. See Quality of TCM Clinical Trials.
Frequently asked questions
Does astragalus boost the immune system?
It changed some immune lab markers in a meta-analysis of small, varied studies, but NCCIH says there is not enough reliable evidence to know whether it is useful for any health condition. [2][1]
Does a Chinese herbal formula prevent colds?
We did not find a readable trial showing that in healthy adults. A review in children with recurrent respiratory infections reported benefit when a formula was added to usual care, with more verification needed. [3]
Who should avoid astragalus?
NCCIH says people with autoimmune diseases should avoid it, and it may interact with immune-suppressing medicines. [1]
Is it safe in pregnancy?
Little is known, and some animal research suggests it may be toxic to the fetus. [1] Ask a clinician first.
Can I use herbs instead of a flu shot?
We found no source supporting that. See Vaccines and Infection Prevention.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety: who should be careful
- Autoimmune disease. NCCIH says astragalus might worsen symptoms of autoimmune diseases, so people with autoimmune diseases should avoid it. [1] See Immunodeficiency and Autoimmune Conditions.
- Medicines that suppress the immune system. NCCIH notes astragalus may interact with medications that suppress the immune system. [1] Talk to your health care provider before using any herbal product with any medicine. [1]
- Pregnancy and breastfeeding. Little is known about safety, and some animal research suggests astragalus can be toxic to the fetus. [1] A review of herbal medicines for respiratory infections also noted that some Chinese herbal medicines may affect reproduction and that evidence for use in pregnancy is lacking. [4]
- Safety evaluation. NCCIH says a thorough safety evaluation of astragalus has not been done. [1]
- Product quality. Combination "immune" products can contain several herbs, and their contents may not match the label. See Chinese Herbal Products: Quality, Contamination and Medicine Interactions.
When to see a doctor first
Frequent or severe infections, or infections that do not clear, are worth discussing with a doctor rather than treating with a supplement. See Frequent Illness and Low Immunity and Herbs and Mushrooms for Immunity.
References
- National Center for Complementary and Integrative Health (NCCIH). Astragalus. Last updated May 2025. Read 2026-10-22.
- Zhang X, Qu X, Zou Y. The effect of astragalus on humoral and cellular immune response: a systematic review and meta-analysis of human studies. Complement Med Res. 2023;30(6):535-543. Read 2026-10-22.
- Zhang L, Wang X, Wang D, et al. Adjuvant treatment with yupingfeng granules for recurrent respiratory tract infections in children: a systematic review and meta-analysis. Front Pediatr. 2022;10:1005745. Read 2026-10-22.
- Huang Z, Pan X, Zhou J, et al. Chinese herbal medicine for acute upper respiratory tract infections and reproductive safety: a systematic review. Biosci Trends. 2019;13(2):117-129. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.