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Which probiotic drink is best for your gut?

Key takeaways

  • Kefir, a milk-based beverage, contains probiotics, antioxidants and nutrients that support gut health.
  • Kombucha, a tea-based probiotic, provides antioxidants and compounds that may reduce intestinal inflammation.
  • Both are generally safe, although kefir may not be suitable for people with lactose intolerance or allergies to milk.

Kefir is a fermented dairy drink while kombucha is a fermented tea drink. Despite their different ingredients, both drinks contain probiotics and other nutrients that may be good for your gut.

Kefir vs Kombucha: Which is Better for Your Gut?

Conclusion: Both drinks support gut health, but neither is proven superior. Personal preference often determines the best choice.

Breakdown of Kefir vs. Kombucha for Gut Health
Kefir Kombucha
Probiotics Lactic acid bacteria, yeast Acetic acid bacteria, yeast
Antioxidants Phenols, carotenoids, flavonoids Polyphenols, flavonoids
Nutrients Protein, amino acids, calcium, B vitamins, magnesium, potassium, iron, zinc, copper Potassium, calcium, copper, iron, manganese, zinc, amino acids, organic acids
Startup Culture Kefir grains Symbiotic culture of bacteria and yeast (SCOBY)
Effects on gut health May improve intestinal permeability and reduce inflammation, promotes short-chain fatty acid (SCFA) production and bowel regularity. May reduce intestinal inflammation, balance the gut microbiome, facilitate bowel movements and improve nutrient absorption.

Kefir vs Kombucha: Their Nutrition Compared

Although kefir and kombucha contain many similar nutrients and bioactive compounds, the two drinks are nutritionally distinct. For example, kefir is high in protein and calcium, while kombucha is not.

Nutrition and Flavor Comparison Between Kefir and Kombucha
8 ounces of kefir 8 ounces of Kombucha
Calories 127 40
Carbohydrates 18 grams (g) 9.8g
Total fat 2.3g 0.02g
Protein 8.8g 0.2g
Calcium 303 milligrams (mg) 0mg
Magnesium 29mg 0mg
Potassium 388 mg 9.9 mg
Sodium 93mg 5 mg
Copper 0.02mg 0.01 mg
Iron 0.1mg 0.02mg
Flavor Sour, slightly sweet Sweet but slightly sour

Note: Nutrient content varies depending on brand and preparation method. Some kombuchas have added minerals, and kefirs can be made with sugar water instead of milk.

Kefir vs Kombucha: what you need to know before drinking them

Kefir and kombucha are generally considered safe to consume, but there are some precautions you should take when drinking them.

  • Kefir contains lactose and milk proteins—avoid in case of intolerance or allergy.
  • Sugar content in both drinks, it can affect blood sugar levels; If you have diabetes, it is essential to closely monitor your blood sugar levels.
  • People with weakened immune systems should consult a healthcare professional before consuming live probiotic drinks.
  • Drug interactions are possible, particularly for immunosuppressants.
  • Digestive adjustment: Start small. 1 to 3 cups of kefir or 4 oz of kombucha per day are generally safe for adults. Avoid kombucha in children due to the potential alcohol content.

Be sure to consult a healthcare professional to determine if kefir and kombucha are right for you.

Quick Tips for Choosing Between Kefir and Kombucha

  • Do you prefer dairy products and proteins? Kefir might be best.
  • Do you like tea and cutting calories? Kombucha could be your choice.
  • Aim: Both drinks are rich in probiotics: choose the one you like to consume regularly.
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts in our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  2. Papadopoulou D, Chrysikopoulou V, Rampaouni A, Tsoupras A. Antioxidant and anti-inflammatory properties of water kefir microbiota and its bioactive metabolites for health-promoting biofunctional products and applications. Microbiol OBJECTIVES. 2024;10(4):756-811. doi:10.3934/microbiol.2024034

  3. Selvaraj S, Gurumurthy K. An overview of probiotic kombucha tea to boost health. Chin Herb Med. 2022;15(1):27-32. doi:10.1016/j.chmed.2022.06.010

  4. Farag MA, Jomaa SA, El-Wahed AA, El-Seedi AHR. The many faces of kefir fermented dairy products: quality characteristics, flavor chemistry, nutritional value, health benefits and safety. Nutrients. 2020;12(2):346. Published January 28, 2020. doi:10.3390/nu12020346

  5. Peluzio MDCG, Dias MME, Martinez JA, Milagro FI. Kefir and modulation of the intestinal microbiota: Implications for human health. Front nut. 2021;8:638740. doi:10.3389/fnut.2021.638740

  6. Costa MAC, Vilela DLS, Fraiz GM et al. Effect of kombucha consumption on gut microbiota and obesity-related comorbidities: a systematic review. Crit Rev Food Sci Nutr. 2023;63(19):3851-3866. doi:10.1080/10408398.2021.1995321

  7. Fraiz GM, Bonifácio DB, De Paulo RS, et al. Benefits of kombucha consumption: a systematic review of clinical trials focusing on microbiota and metabolic health. Fermentation. 2025;11(6):353. doi:10.3390/fermentation11060353

  8. USDA Food Data Center. Tea, kombucha.

  9. USDA Food Data Center. Kefir.

  10. Happel AU, Barnabas SL, Froissart R, Passmore JS. Assessing the risks and benefits of probiotic use in HIV-infected and immunocompromised populations. Beneficial microbes. 2018;9(2):239-246. doi:10.3920/BM2017.0106

  11. Culpepper T. The effects of kefir and kefir components on immune and metabolic physiology in preclinical studies: a narrative review. Curéus. 2022;14(8):e27768. doi:10.7759/cureus.27768

  12. Kapp JM, Sumner W. Kombucha: a systematic review of empirical evidence for human health benefits. Ann Epidemiol. 2019;30:66-70. doi:10.1016/j.annepidem.2018.11.001


By Brittany Lubeck, MS, RDN

Lubeck is a registered dietitian and freelance nutrition writer with a master’s degree in clinical nutrition.

Verywell Health is part of the People Inc publishing family.





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