Not proven. The human evidence is a handful of small trials. In a randomized trial of healthy adults, four weeks of kombucha did not change inflammation markers. A 10-week trial in people losing weight found a small edge on one marker, IL-6. Nobody has pooled these trials yet.
Where the anti-inflammatory claim comes from
Kombucha is tea fermented by a "Symbiotic Culture of Bacteria and Yeast," the rubbery disc people call a SCOBY. The result is a tart, fizzy, acidic drink.
Its health reputation is built on what it contains. Reviews credit its bioactive compounds with antioxidant, antimicrobial and probiotic effects. One 2024 review calls it "a healthy and safe beverage with multiple health benefits." It also discusses potential toxicity.
Here's the catch. Most of that work was done in test tubes and animals. A 2026 trial team put it plainly: lab and animal studies suggest kombucha has anti-inflammatory properties, but "no clinical trials have confirmed that."
How many human studies are there?
Very few. In 2018, researchers searched three large databases for every paper on kombucha. They reviewed 310 articles and found one study reporting kombucha research in people. They also found no registered human trials under way. Their verdict was simple. The health claims needed to be tested in human clinical trials.
Lab and animal studies suggest kombucha calms inflammation. No clinical trial has confirmed it.From a 2026 study in Food Funct
Since then, a small number of trials have arrived. That is progress. But it is a short shelf, and most of the trials ran for 12 weeks or less.
Does kombucha lower inflammation markers?
Inflammation markers are proteins in the blood that rise when the body's immune system is on alert. They include CRP (C-reactive protein) and signals called cytokines, like IL-6. A randomized trial assigns people to groups by chance, which makes it a fair test.
Healthy adults, four weeks. A 2024 randomized trial gave kombucha to 16 healthy adults eating a typical Western diet, with 8 more as a control group. Researchers found no significant changes in circulating markers of inflammation. Kombucha drinkers did gain more of some gut bacteria, including a probiotic found in kombucha.
Adults losing weight, 10 weeks. A 2024 randomized trial put 59 adults with excess weight on a calorie-cut diet. Half also drank 200 mL of green tea kombucha a day. Both groups lost weight, and the kombucha did not add to it. Two cytokines fell in both groups. The one difference showed up in IL-6, which rose in the diet-only group compared with the kombucha group. Modest. And from one small trial.
The same research team reported more results from a 10-week trial of the same design. Kombucha lowered one oxidative stress marker, hydrogen peroxide, but the other markers did not change. Across the whole group, cholesterol and blood sugar markers showed no significant differences between the kombucha and diet-only groups.
Adults with and without obesity, eight weeks. A 2026 study gave 200 mL of black tea kombucha a day to 36 adults. Most inflammation markers, including hs-CRP, changed over time. But this was a before-and-after study with no comparison group, so it can't show that kombucha caused those changes.
Does kombucha cause inflammation?
The trials don't show that either. None of these studies reported a rise in the usual inflammation markers from kombucha. Two results are worth a look, though.
In the four-week trial, fasting insulin and HOMA-IR rose within the kombucha group. HOMA-IR is a measure of insulin resistance, where the body handles blood sugar less well. The authors said the small group and the large differences between people may explain their modest results.
In a 2026 trial of 90 beginner runners, 12 weeks of green tea kombucha did not change the main antioxidant measure. The kombucha group had more neutrophils and fewer lymphocytes, two types of white blood cells. After a stricter statistical check, the authors called these findings exploratory.
What about fermented foods in general?
Kombucha may borrow its glow from a bigger idea. In a 2021 randomized trial, 36 healthy adults ate either a high-fiber diet or a high-fermented-food diet for 17 weeks. The fermented-food diet steadily raised gut microbe diversity and lowered inflammatory markers.
Still, the wider record is mixed. A 2020 meta-analysis, which pools many trials, combined 26 publications with 1,461 people. Fermented foods lowered TNF-alpha, another inflammation signal. They did not change CRP or IL-6.
What this means for you
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The bottom line
Kombucha's reputation got to the store shelf before the science got to people. In 2018, a search of 310 papers turned up one human study. Since then, a few small trials have tested it, and they mostly shrug: no change in healthy adults, a small IL-6 edge during weight loss, a before-and-after study that can't prove cause. Fermented foods as a group look more promising than any single drink. So enjoy the fizz. Just don't pay for a promise the trials haven't made.
Common questions
Does kombucha cause inflammation in the body?
The human trials so far don't show that. In a randomized trial of healthy adults, four weeks of kombucha did not change inflammation markers in the blood. In a 10-week trial of adults losing weight, IL-6 actually rose in the group that skipped kombucha. One trial in runners saw shifts in white blood cell counts, which the authors called exploratory.
Does kombucha reduce gut inflammation?
No human trial we found measured inflammation inside the gut. Kombucha did change gut bacteria. In a 2024 trial, kombucha drinkers had more of a probiotic found in kombucha and more bacteria that make short-chain fatty acids. But that same trial found no change in blood inflammation markers. A gut bacteria shift is not proof of calmer inflammation.
Is kombucha anti-inflammatory for arthritis?
We found no trial of kombucha in people with arthritis. The 2018 review found one human study of any kind, and none in clinical trial registries. Every trial we found since then tested healthy adults, runners, or people with excess weight. Claims about kombucha and joint pain rest on lab and animal work, not people.
How much kombucha did the trials use?
Most gave people 200 mL a day, which is a small glass. The trials lasted from four weeks to 12 weeks. That matters when you read a claim online. These were short tests of a modest daily amount, in small groups, so nobody yet knows what larger amounts or years of drinking do.
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How this article was made
Researched and written from 10 peer-reviewed papers. Our automated check matched every claim against the exact words of its source, confirmed every paper exists in PubMed, and found none retracted. Checked November 1, 2026. Not individually reviewed by a doctor. Photos are illustrative; the people in them are not patients or readers.
Grades run Strong, Moderate, Emerging, Early and Not supported, and the grade decides the words we may use. How we grade evidence · Medical disclaimer
Sources
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- Randomized trialModulating the human gut microbiome and health markers through kombucha consumption: a controlled clinical study.Ecklu-Mensah G, Miller R, Maseng MG et al. Sci Rep, 2024.PubMedFull paper
- Randomized trialGreen Tea Kombucha Impacts Inflammation and Salivary Microbiota in Individuals with Excess Body Weight: A Randomized Controlled Trial.Fraiz GM, Bonifácio DB, Lacerda UV et al. Nutrients, 2024.PubMedFull paper
- StudyRegular black tea kombucha consumption is associated with improved insulin resistance and increased ADIPOQ expression in adults with obesity: a pre-post clinical trial.de Campos Costa MA, Macedo Fraiz G, Rezende Cardoso R et al. Food Funct, 2026.PubMedFull paper
- Randomized trialAcute and Chronic Effects of Green Tea Kombucha With and Without Grape Skin Extract on Immune and Oxidative Stress Markers in Beginner Runners: A Randomized Controlled Trial.Bonifácio DB, de Paulo RS, Mendes PHV et al. J Food Sci, 2026.PubMedFull paper
- Randomized trialEffect of regular green tea (Camellia sinensis) kombucha consumption on oxidative stress and endothelial health in individuals with excess body weight: a randomized controlled trial.Bonifácio DB, Macedo Fraiz G, Lacerda UV et al. Br J Nutr, 2025.PubMedFull paper
- Randomized trialEffect of Green Tea Kombucha Within an Energy-Restricted Diet on Cardiometabolic Risk Markers in Individuals With Excess Body Weight: A Randomized Controlled Trial.Bonifácio DB, Fraiz GM, Lacerda UV et al. J Food Sci, 2026.PubMedFull paper
- Randomized trialGut-microbiota-targeted diets modulate human immune status.Wastyk HC, Fragiadakis GK, Perelman D et al. Cell, 2021.PubMedFull paper
- Meta-analysisFermented foods and inflammation: A systematic review and meta-analysis of randomized controlled trials.SaeidiFard N, Djafarian K, Shab-Bidar S Clin Nutr ESPEN, 2020.PubMedFull paper
- ReviewAdditional advances related to the health benefits associated with kombucha consumption.Esatbeyoglu T, Sarikaya Aydin S, Gültekin Subasi B et al. Crit Rev Food Sci Nutr, 2024.PubMedFull paper
