Probiotics

Kombucha

Also called: fermented tea

Fermented sweet tea.

Why people take it
Gut health, energy.
What the evidence says
No good human evidence.
How it is usually taken
Up to about 120 ml a day from a safe source; home brews can be contaminated.
Be careful
Home-brewed kombucha can be contaminated; contains small amounts of alcohol.
Medicines it can interact with
Contains small amounts of alcohol and caffeine.

Other probiotics

Lactobacillus rhamnosus GGSaccharomyces boulardiiBifidobacteriumKefir

Common questions

What is Kombucha?

Fermented sweet tea.

Why do people take Kombucha?

Gut health, energy.

Does Kombucha work?

No good human evidence.

How much Kombucha do people take?

Up to about 120 ml a day from a safe source; home brews can be contaminated.

Is Kombucha safe?

Home-brewed kombucha can be contaminated; contains small amounts of alcohol.

Does Kombucha interact with medicines?

Contains small amounts of alcohol and caffeine.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.