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
Garlic benefits: where the science stands
For heart: not settled yet.
Heart is what most people take garlic for, and the best studies disagree: one found it helps, one found no effect. As of August 2026, the verdicts on this page rest on evidence from 111 trials, drawn from the strongest research among the 538 papers on PubMed that mention garlic. Every claim is checked below.
538 papers on PubMed · evidence from 111 trials
Claim by claim
- HeartThe science is still forming. The best studies disagree.
- Blood pressureWell studied, and it works. The biggest review covered 20 trials.
- Blood sugarWell studied, and it works. Tested in 187 people.
- Cancer preventionThe science is still forming. The best studies disagree.
See 7 more scored claims+
- CholesterolThe science is still forming. The best studies disagree.
- EnduranceAlmost no real studies. Nothing clear so far.
- Immunity and coldsThe science is still forming. The best studies disagree.
- InflammationThe science is still forming. The best studies disagree.
- Interactions with medicinesThe science is still forming. A safety question was raised.
- JointsThe science is still forming. Results lean positive, but there is not much yet.
- Weight and body fatThe science is still forming. The best studies disagree.
Pairs people ask about
The 29 sources we read
- 1993Crossover trial · 10 people · no clear effect on cholesterolsource
- 2001Randomized trial · 146 people · large benefit for immunity and coldssource
- 2005Crossover trial · 15 people · benefit for heart; no clear effect on inflammationsource
- 2006Randomized trial · 50 people · benefit for immunity and coldssource
- 2006Randomized trial · 52 people · no clear effect on interactions with medicinessource
- 2009Meta-analysis · pools 13 trials, 1,056 people · no clear effect on cholesterolsource
- 2013Randomized trial · 79 people · moderate benefit for blood pressuresource
- 2014Meta-analysis · pools 1 trials, 146 people · no clear effect on immunity and coldssource
- 2016Meta-analysis · benefit for cholesterolsource
- 2016Randomized trial · 120 people · no clear effect on immunity and coldssource
- 2016Meta-analysis · pools 20 trials, 970 people · moderate benefit for blood pressuresource
- 2017Meta-analysis · a harm signal on interactions with medicinessource
- 2019Randomized trial · 3,365 people · no clear effect on cancer preventionsource
- 2020Meta-analysis · pools 10 trials · no clear effect on heartsource
- 2020Meta-analysis · pools 17 trials · benefit for inflammationsource
- 2020Randomized trial · 90 people · benefit for blood sugar; benefit for weight and body fatsource
- 2020Randomized trial · 70 people · moderate benefit for jointssource
- 2021Randomized trial · 80 people · no clear effect on blood pressure; small benefit for cholesterolsource
- 2021Meta-analysis · pools 10 trials, 530 people · no clear effect on inflammationsource
- 2022Meta-analysis · benefit for cholesterolsource
- 2022Crossover trial · 36 people · no clear effect on blood pressure; no clear effect on cholesterolsource
- 2022Meta-analysis · no clear effect on immunity and coldssource
- 2023Randomized trial · 190 people · no clear effect on cholesterolsource
- 2023Randomized trial · small benefit for blood pressuresource
- 2023Observational study · 3,229 people · small benefit for cancer preventionsource
- 2023Crossover trial · 11 people · no clear effect on endurancesource
- 2025Meta-analysis · pools 19 trials · small benefit for blood pressure; small benefit for cholesterolsource
- 2025Randomized trial · 97 people · moderate benefit for blood sugar; moderate benefit for cholesterolsource
- 2026Meta-analysis · small benefit for blood pressure; small benefit for blood sugar; small benefit for cholesterol; benefit for inflammation; no clear effect on weight and body fatsource
Chosen as the strongest evidence out of 538 papers on PubMed. Every row links to its paper.
Fair questions
Does garlic work?+
For heart, it is not settled. The best studies disagree.
Is garlic safe?+
No caution is recorded on this page. That is not a safety guarantee; the studies we read were not safety trials.
Why only 29 sources, when PubMed lists 538?+
The 538 is every paper that mentions garlic 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 29 cover 111 trials between them, and every one is linked above. Both counts are measured, not estimated.