Not clearly, at least not yet. A 2025 meta-analysis of 7 randomized trials with 385 adults found kefir did not lower CRP overall, though CRP did drop when people drank it for 8 weeks or more. A 2026 review of 24 studies found no effect on inflammation markers.
What kefir is, and why people think it calms inflammation
Kefir is a sour, drinkable fermented milk. It is made with a mix of bacteria and yeasts, the starters that turn milk into kefir. Fermented dairy foods in general can be made with bacteria alone, or with bacteria and yeast together.
The hope is simple. Your gut is home to trillions of microbes, and they talk to your immune system. Feed the gut live microbes and maybe the immune system settles down.
There is some real support for that idea. In a 2021 randomized trial, 18 healthy adults ate a diet high in fermented foods for 17 weeks. Their gut microbes grew more diverse and their inflammatory markers went down. That study tested a range of fermented foods, not kefir alone, so it tells us the idea is worth testing without telling us that kefir in particular does the job.
Does kefir lower CRP?
CRP, short for C-reactive protein, is a blood marker your liver makes more of when inflammation is up. It is the marker most kefir trials checked.
Seven trials pooled together did not move CRP, unless people kept drinking kefir for 8 weeks or more.From a 2025 meta-analysis in Endocrinol Diabetes Metab
A 2025 meta-analysis pooled 7 randomized trials with 385 adults. A meta-analysis combines the results of many studies to get a clearer answer. Overall, kefir did not lower CRP compared with not drinking it. When the authors split the trials by length, though, CRP did drop in the ones where people drank kefir for 8 weeks or more.
A 2026 meta-analysis cast a wider net, with 24 studies. It found no effect on inflammation markers, weight or cholesterol.
Single trials tell the same mixed story. In 28 overweight adults who drank kefir for 3 weeks and milk for 3 weeks, CRP did not change with either drink. In 67 men over 65 who were overweight or obese, 8 weeks of kefir with two added probiotic strains did no better on inflammation than regular kefir.
So the honest answer for now: a possible small effect after two months or more, and no clear effect before that.
Not every kefir is the same kefir
The most interesting result is also one of the smallest. In a 2023 pilot trial, 21 men with high LDL cholesterol drank 2 servings of kefir a day for 4 weeks, then switched to a different kefir.
One kefir was made with the traditional kefir organisms. The other was a store-style kefir made without them. The traditional kefir lowered several markers of inflammation and blood vessel stress, including CRP and TNF-alpha, more than the other one did. TNF-alpha is another signal the body uses to turn inflammation up. The kefir made without traditional organisms actually raised TNF-alpha compared with where people started.
That is one study with 21 people. Still, it gives a reason the pooled results look so mixed: trials may have tested drinks that share a name but not the same microbes.
Kefir vs yogurt: which is better for inflammation?
Nobody has tested them head to head for inflammation, at least not in the studies we found. What we have is a 2023 meta-analysis of fermented dairy that included 14 trials: 9 on yogurt, 4 on fermented milk and only 2 on kefir.
Taken together, those foods lowered CRP a little. They did not change other markers such as IL-6 or TNF-alpha. The authors called the link "slight" and said to read it with caution. Because yogurt made up most of those trials, yogurt simply has more evidence behind it. That says more about what has been studied than about which food works better.
What kefir does seem to change
Inflammation is not the only reason people drink kefir. Two meta-analyses found it lowered insulin resistance, which is how hard the body has to work to move sugar out of the blood. The 2026 review also found it lowered fasting blood sugar.
In the gut, the picture is modest. A 2026 review of 8 human studies found kefir caused small, uneven changes in gut microbes. One helpful group, Bifidobacterium, went up in 3 of 4 studies that measured it.
What this means for you
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you have a milk allergy, a weakened immune system, or diabetes and take medicine to lower your blood sugar, or if you have been told to limit dairy for a gut or kidney condition.
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The bottom line
Kefir has a good story: live bacteria, live yeasts, a gut that talks to the immune system, and a trial where a fermented-food diet calmed inflammation markers. The kefir trials themselves are thinner. Seven trials pooled together did not move CRP, a 24-study review found nothing, and the one striking result came from 21 men. If you enjoy kefir, keep drinking it, give it months, and treat any effect on inflammation as a maybe. The bigger levers still sit elsewhere in your week.
Common questions
Is kefir inflammatory or anti-inflammatory?
Neither, based on the trials so far. Reviews of the kefir trials found no clear rise or fall in inflammation markers overall. One small trial found that a kefir made without traditional organisms raised TNF-alpha, an inflammation signal, while kefir made with them lowered several markers. That result needs a bigger study before anyone should act on it.
Does kefir reduce inflammation in the body?
Not reliably, from what trials have measured. A 2025 meta-analysis of 7 randomized trials found no overall drop in CRP. But the trials where people drank kefir for 8 weeks or more did show lower CRP. In a separate trial of 28 overweight adults, 3 weeks of kefir left CRP unchanged. Time may matter.
Should kefir be part of an anti-inflammatory diet?
It can be, as one fermented food among several. A 17-week randomized trial found a diet high in fermented foods lowered inflammatory markers and raised gut microbe diversity in healthy adults. That trial did not test kefir alone. Kefir also lowered insulin resistance in pooled trials. It just has not been shown to lower inflammation by itself.
Is kefir better than yogurt for gut health?
We can't say yet. Kefir raised Bifidobacterium, a helpful gut bacteria group, in 3 of 4 studies that checked, but other changes were small and uneven. Yogurt had more trials in a review of fermented dairy and inflammation, 9 against 2 for kefir. No trial in our sources compared the two directly.
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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 October 31, 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
- Meta-analysisThe Effect of Kefir Consumption on Blood Pressure and C-Reactive Protein: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.Rashidbeygi E, Samarin MM, Sheikhhossein F et al. Endocrinol Diabetes Metab, 2025.PubMedFull paper
- Meta-analysisEffect of different kefir dosages on inflammation status, metabolic profile, and anthropometric measurements in adults: A systematic review and meta-analysis.Hamsho M, Hawari R, Yeşil Z et al. Nutr Metab Cardiovasc Dis, 2026.PubMedFull paper
- Meta-analysisEffects of fermented dairy products on inflammatory biomarkers: A meta-analysis.Zhang X, Luo Q, Guan X et al. Nutr Metab Cardiovasc Dis, 2023.PubMedFull paper
- Randomized trialConsumption of kefir made with traditional microorganisms resulted in greater improvements in LDL cholesterol and plasma markers of inflammation in males when compared to a commercial kefir: a randomized pilot study.Bourrie BCT, Forgie AJ, Makarowski A et al. Appl Physiol Nutr Metab, 2023.PubMedFull paper
- Randomized trialEffects of kefir or milk supplementation on zonulin in overweight subjects.Pražnikar ZJ, Kenig S, Vardjan T et al. J Dairy Sci, 2020.PubMedFull paper
- Randomized trialThe effect of probiotic-fortified kefir on depression, appetite, oxidative stress, and inflammatory parameters in Iranian overweight and obese elderly: a randomized, double-blind, placebo-controlled clinical trial.Noori M, Shateri Z, Babajafari S et al. J Health Popul Nutr, 2025.PubMedFull paper
- Systematic reviewThe effects of kefir consumption on human health: a systematic review of randomized controlled trials.Kairey L, Leech B, El-Assaad F et al. Nutr Rev, 2023.PubMedFull paper
- Meta-analysisEffects of Kefir Consumption on Cardiometabolic Risk Factors: A Systematic Review and Meta-analysis of Randomized Controlled Trials.Yahyapoor F, Haghighat N, Sohrabi Z et al. Curr Drug Targets, 2023.PubMedFull paper
- Systematic reviewKefir: A Potential Gut Microbiota Modulator: A Systematic Review of Human Interventional Studies.Hamsho M, Ranneh Y, Kaddour B et al. Microbiologyopen, 2026.PubMedFull paper
- Randomized trialGut-microbiota-targeted diets modulate human immune status.Wastyk HC, Fragiadakis GK, Perelman D et al. Cell, 2021.PubMedFull paper
