What do the states mean?+
- Solid: well studied, and it works.
- Half-there: the science is still forming.
- A ghost: almost no real studies.
- Hollow: well studied, and it does not work.
- A cord: the pair itself has been tested together.
- Air: nobody has ever tested this pair.
The full scoring method: How we score
Astragalus benefits: where the science stands
For immunity and colds: not settled yet.
Immunity and colds are what most people take astragalus for, and the strongest evidence says it helps (a combined review, plus a trial of 18 people). As of August 2026, the verdicts on this page rest on evidence from 15 trials, drawn from the strongest research among the 121 papers on PubMed that mention astragalus. Every claim is checked below.
121 papers on PubMed · evidence from 15 trials
Claim by claim
- Immunity and coldsThe science is still forming. Results lean positive, but there is not much yet.
- CholesterolAlmost no real studies. What exists leans positive.
- Energy and fatigueThe science is still forming. Results lean positive, but there is not much yet.
- Healthy ageingThe science is still forming. The best studies disagree.
See 2 more scored claims+
- InflammationThe science is still forming. The best studies disagree.
- JointsAlmost no real studies. Nothing clear so far.
Pairs people ask about
The eight sources we read
- 2018Crossover trial · 40 people · benefit for cholesterol; benefit for inflammationsource
- 2021Randomized trial · 18 people · benefit for immunity and coldssource
- 2022Crossover trial · 11 people · benefit for inflammationsource
- 2024Randomized trial · 40 people · benefit for healthy ageingsource
- 2025Meta-analysis · no clear effect on healthy ageing; no clear effect on inflammationsource
- 2025Meta-analysis · benefit for immunity and coldssource
- 2025Meta-analysis · pools 8 trials · large benefit for energy and fatiguesource
- 2026Randomized trial · no clear effect on jointssource
Chosen as the strongest evidence out of 121 papers on PubMed. Every row links to its paper.
Fair questions
Does astragalus work?+
For immunity and colds, it is not settled. Results lean positive, but there is not much yet.
Is astragalus safe?+
No caution is recorded on this page. That is not a safety guarantee; the studies we read were not safety trials.
Why only 8 sources, when PubMed lists 121?+
The 121 is every paper that mentions astragalus in any way: animal studies, blood measurements, papers where it is a side note. The strongest sources are combined reviews, and each one already gathers every trial its authors could find. Our 8 cover 15 trials between them, and every one is linked above. Both counts are measured, not estimated.