Yu Ping Feng San (Jade Windscreen Powder)
Yu Ping Feng San (Jade Windscreen Powder) is a three-herb classical formula; here is what reviews found for asthma, allergic rhinitis, COPD and children's infections.
Content last updated . This page has not been medically reviewed.
What it is
Yu Ping Feng San, often translated as Jade Windscreen Powder or Jade Screen Powder, is a classical Chinese herbal formula. Researchers describe it as made of three herbs: astragalus (Huang Qi), atractylodes (Bai Zhu) and saposhnikovia (Fang Feng). [1] It is also written Yupingfeng, and in Korean literature as Okbyungpoongsan. [2] For how Chinese formulas are put together, see How a Chinese Herbal Formula Is Built.This page is information only. It gives no doses and no advice on using the formula for any condition.
What research shows
Most trials test the formula added to standard care, mainly in China. Reviewers repeatedly note small studies and variable quality. For publication-bias concerns in Chinese trials generally, see Publication Bias and Positive-Result Concerns in Chinese Trials.| Question | What the source found | Strength of evidence |
|---|---|---|
| Adult asthma, added to usual treatment | A 2026 review of 20 trials (1,896 people) found a higher response rate and better lung-function scores with the formula plus usual care; the authors say moderate study quality and the lack of blinding and placebo control mean results need confirming. [1] | Promising but limited |
| Stable COPD, added to Western medicines | A review of nine trials (660 people) with poor methodological quality found better FEV1 and walking distance, no difference in IgE, and no serious adverse events identified. [3] | Promising but limited |
| COPD, newer review | A 2025 meta-analysis rated certainty moderate for overall efficacy and high for some lung-function measures, though other outcomes were low certainty. [4] | Promising but limited |
| Allergic rhinitis, with acupuncture | A review of nine trials (686 people) compared the formula plus acupuncture with other treatments and found a higher effective rate. The combined design cannot separate the formula from the acupuncture. [5] | Insufficient evidence for the formula alone |
| Repeated respiratory infections in children, added to usual care | A review of 17 trials found a higher clinical response rate, but the authors said effectiveness and safety remain to be verified. [6] | Promising but limited |
Several of these reviews report blood immune markers such as IgA and IgG. [6][3] Changes in a laboratory marker are not the same as fewer infections or better breathing. Claims that the formula "boosts immunity" are marketing claims, and the research here does not show that. For the wider question, see TCM and "Immune Support": Claims and What Is Known.
Which herbs, and what to know about them
Astragalus is the lead herb. NCCIH says there is not enough reliable evidence to know whether astragalus helps any health condition. [7] See Astragalus in Chinese Medicine.Related pages
TCM for Allergies, Asthma and Hay Fever compares options by evidence. Chinese Herbal Products: Quality, Contamination and Medicine Interactions covers label reading.Frequently asked questions
What is Yu Ping Feng San?
It is a classical three-herb Chinese formula of astragalus, atractylodes and saposhnikovia. [1]
Does it help asthma or COPD?
Reviews of trials, mostly in China and added to usual care, report better response rates and lung-function scores, but the authors call for better-designed trials. [1][3]
Does it prevent colds in children?
A review of 17 trials found higher clinical response when it was added to usual care, but the authors say effectiveness and safety remain to be verified. [6]
Who should be careful with it?
People with autoimmune conditions or on medicines that suppress the immune system, because of astragalus. [7]
Does it "boost the immune system"?
Reviews report changes in blood markers, but that is not proof of fewer infections; "immune boosting" is a marketing claim here. [6]
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
- Autoimmune disease and immune-suppressing medicines. Astragalus might worsen autoimmune disease symptoms and may interact with medicines that suppress the immune system. [7] This matters for anyone with an autoimmune condition, a transplant, or on such treatment.
- Adverse events. In the asthma review only two studies reported adverse events, mild ones such as stomach upset and dry mouth. That is thin safety data. [1]
- Pregnancy and breastfeeding. Little is known about the safety of astragalus in pregnancy or while breastfeeding. [7]
- Children. The children's reviews are of trials in China as an add-on to usual care. Do not give a child a herbal powder without a clinician's advice.
- Quality. Some Chinese herbal products have been contaminated with toxic compounds, heavy metals, pesticides or microorganisms. [8]
- Not a replacement for care. Asthma and COPD flare-ups with trouble breathing need urgent medical care. Do not stop an inhaler or other prescribed medicine for an herbal formula.
References
- Front Pharmacol 2026. Efficacy of Yupingfeng powder in the treatment of bronchial asthma in adults: systematic review and meta-analysis. Read 2026-10-22.
- Medicine (Baltimore) 2018. Okbyungpoongsan (Yupingfeng) for treating allergic rhinitis: protocol for a systematic review. Read 2026-10-22.
- Afr J Tradit Complement Altern Med 2014. Modified Yupingfeng formula for stable COPD: systematic review of RCTs. Read 2026-10-22.
- J Ethnopharmacol 2025. Yupingfeng in treating COPD: a meta-analysis and in silico study. Read 2026-10-22.
- Allergol Immunopathol 2025. Yupingfeng powder combined with acupuncture on allergic rhinitis: systematic review and meta analysis. Read 2026-10-22.
- Front Pediatr 2022. Adjuvant yupingfeng granules for recurrent respiratory tract infections in children: systematic review and meta-analysis. Read 2026-10-22.
- NCCIH. Astragalus. Read 2026-10-22.
- NCCIH. Traditional Chinese Medicine: What You Need To Know. Read 2026-10-22.