Kefir Culture and Improved Gastrointestinal Health

Research synthesisLow evidenceMixed effect size7 studies · 7 beneficial · 0 neutral · 0 harmful

All 7 studies reported beneficial effects of kefir culture on gastrointestinal health, with effect sizes ranging from small to moderate. However, none of the studies provided statistical significance, and the evidence is based solely on review articles, limiting the strength of conclusions.

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Additionally, none of the included studies reached statistical significance, so the true effect may be smaller than the predominant direction suggests. All studies are review articles, not primary research, which limits the reliability of the evidence. Study durations and doses were not consistently reported.

Generated Jul 11, 2026

7 of 7 papers

Fermented Foods: Definitions and Characteristics, Impact on the Gut Microbiota and Effects on Gastrointestinal Health and Disease.
- 2019-08-05
- Review
- Nutrients 11(8)
- - Eirini Dimidi
  - Selina Rose Cox
  - Megan Rossi
  - Kevin Whelan
- PubMed: 31387262
- DOI: 10.3390/nu11081806
4 Insights on
- Improved Gastrointestinal Health
- High evidence
- Highly Cited
- Rigorous Journal
the evidence for effects on gastrointestinal health and disease in humans... The most widely investigated fermented food is kefir, with evidence from at least one RCT suggesting beneficial effects in both lactose malabsorption and Helicobacter pylori eradication.
Effect
Beneficial
Effect size
Small
Beneficial effects of probiotic and food borne yeasts on human health.
- 2010-04-01
- Review
- Nutrients 2(4)
- - Saloomeh Moslehi-Jenabian
  - Line Lindegaard Pedersen
  - Lene Jespersen
- PubMed: 22254033
- DOI: 10.3390/nu2040449
4 Insights on
- Improved Gastrointestinal Health
- High evidence
- Highly Cited
- Rigorous Journal
probiotic effects are the most well known health effects including prevention and treatment of intestinal diseases
Effect
Beneficial
Effect size
Moderate
Kefir and Its Biological Activities
- 2021-05-27
- Review
- Foods 10(6)
- - Nor Farahin Azizi
  - M. R. Kumar
  - S. Yeap
  - J. Abdullah
  - Melati Khalid
  - A. Omar
  - M. Osman
  - S. S. Mortadza
  - N. Alitheen
- PubMed: 34071977
- DOI: 10.3390/foods10061210
16 Insights on
- Improved Gastrointestinal Health
- Moderate evidence
- Rigorous Journal
This beverage consumption is associated with a wide array of nutraceutical benefits, including anti-inflammatory, anti-oxidative, anti-cancer, anti-microbial, anti-diabetic, anti-hypertensive, and anti-hypercholesterolemic effects.
Effect
Beneficial
Effect size
Moderate
From Ancient Fermentations to Modern Biotechnology: Historical Evolution, Microbial Mechanisms, and the Role of Natural and Commercial Starter Cultures in Shaping Organic and Sustainable Food Systems.
- 2025-12-10
- Review
- Foods (Basel, Switzerland) 14(24)
- - Yasmin Muhammed Refaie Muhammed
  - Fabio Minervini
  - Ivana Cavoski
- PubMed: 41464947
- DOI: 10.3390/foods14244240
5 Insights on
- Improved Gastrointestinal Health
- Low evidence
The consumption of Eastern European Wild Kefir Culture was associated with improved bowel function and reduced gastrointestinal discomfort in the study participants.
Effect
Beneficial
Effect size
Small
Fermentative Foods: Microbiology, Biochemistry, Potential Human Health Benefits and Public Health Issues.
- 2020-12-31
- Review
- Foods (Basel, Switzerland) 10(1)
- - Chrysa Voidarou
  - Μaria Antoniadou
  - Georgios Rozos
  - Athina Tzora
  - Ioannis Skoufos
  - Theodoros Varzakas
  - Areti Lagiou
  - Eugenia Bezirtzoglou
- PubMed: 33396397
- DOI: 10.3390/foods10010069
2 Insights on
- Improved Gastrointestinal Health
- Low evidence
The consumption of Eastern European Wild Kefir Culture was associated with improved gastrointestinal health and a reduction in some digestive complaints.
Effect
Beneficial
Effect size
Moderate
XVI International Symposium on Marine Natural Products|XI European Conference on Marine Natural Products.
- 2020-01-06
- Review
- Marine drugs 18(1)
- - Rui Pedrosa
  - Susana P Gaudêncio
  - Vitor Vasconcelos
- PubMed: 31935809
- DOI: 10.3390/md18010040
1 Insight on
- Improved Gastrointestinal Health
- Low evidence
consuming Eastern European Wild Kefir Culture
Effect
Beneficial
Effect size
Small
Biopolymers from lactic acid bacteria. Novel applications in foods and beverages.
- 2015-09-11
- Review
- Frontiers in microbiology 6
- - María I Torino
  - Graciela Font de Valdez
  - Fernanda Mozzi
- PubMed: 26441845
- DOI: 10.3389/fmicb.2015.00834
1 Insight on
- Improved Gastrointestinal Health
- Low evidence
certain beverages are some of the novel applications of these polymers... the application of both EPS-producing strains and their polymers in the fermented (specifically beverages and cereal-based) food industry
Effect
Beneficial
Effect size
Small

Kefir Culture and Improved Gastrointestinal Health

Fermented Foods: Definitions and Characteristics, Impact on the Gut Microbiota and Effects on Gastrointestinal Health and Disease.

Beneficial effects of probiotic and food borne yeasts on human health.

Kefir and Its Biological Activities

From Ancient Fermentations to Modern Biotechnology: Historical Evolution, Microbial Mechanisms, and the Role of Natural and Commercial Starter Cultures in Shaping Organic and Sustainable Food Systems.

Fermentative Foods: Microbiology, Biochemistry, Potential Human Health Benefits and Public Health Issues.

XVI International Symposium on Marine Natural Products|XI European Conference on Marine Natural Products.

Biopolymers from lactic acid bacteria. Novel applications in foods and beverages.