Kombucha is a fermented tea, so it can naturally contain small amounts of alcohol. But how much alcohol is actually in kombucha, and does it count as an alcoholic drink?
If you're new to kombucha, this is one of the most common questions and it's a good one.
The short answer is: fermented kombucha can contain naturally occurring alcohol, and the amount can vary depending on how it is brewed, fermented, bottled and stored.
Let's look at what that means.
Why does kombucha contain alcohol?
Kombucha is made by fermenting sweetened tea with a SCOBY a Symbiotic Culture of Bacteria and Yeast.
During fermentation, yeasts convert some of the available sugars into ethanol (alcohol) and other compounds. Bacteria in the culture can then further transform some of these fermentation products, contributing to kombucha's characteristic acidity and flavour.
So the presence of a small amount of alcohol isn't something added to kombucha.
It's a natural part of fermentation.
This is similar to what happens in other fermented foods and drinks: microorganisms transform ingredients over time, creating new flavours and compounds along the way.
How much alcohol is usually in kombucha?
There isn't one universal alcohol percentage for kombucha.
The alcohol content can vary considerably depending on:
- Fermentation time
- Temperature
- Amount and type of sugar
- Yeast and bacterial cultures
- Bottle conditioning or second fermentation
- Flavour ingredients
- Storage conditions
Research has found that commercially available kombucha can contain varying levels of ethanol, which is why alcohol content shouldn't simply be assumed from the word "kombucha" alone.
For this reason, the most reliable figure for a particular bottle is the manufacturer's tested ABV and product labelling.
Is kombucha an alcoholic drink?
Kombucha is generally made and consumed as a fermented, non-alcoholic or low-alcohol beverage, rather than as an alcoholic drink like wine or beer.
However, fermented kombucha isn't necessarily completely alcohol-free.
In the UK, current government guidance uses 0.05% ABV or less for the "alcohol free" descriptor, while drinks at 1.2% ABV or below fall within the government's current "low alcohol" descriptor range. These are labelling descriptors and should not be confused with the separate rules governing alcohol duty.
This is why it's important not to assume that every kombucha contains exactly zero alcohol.
Does kombucha continue to ferment in the bottle?
It can.
Kombucha is a living fermented beverage, and fermentation can continue after bottling depending on the production process and storage conditions.
This is particularly relevant when kombucha undergoes a second fermentation, which can help create natural carbonation.
As fermentation continues, yeast can produce additional carbon dioxide and ethanol.
Temperature also matters. Warmer conditions can accelerate fermentation, which is one reason properly produced kombucha is commonly kept refrigerated.
What about Vesna kombucha?
At Vesna, fermentation is at the heart of how we make our kombucha.
We brew in small batches, use glass fermentation vessels, and allow our kombucha to develop over approximately 21 days.
Because our kombucha is fermented and unpasteurised, we don't describe it as completely alcohol-free unless the specific product has been tested to meet the applicable threshold.
Instead, we believe in being transparent about what kombucha actually is:
It's fermented tea.
And fermentation naturally comes with some variation.
If you're avoiding alcohol completely for personal, religious, medical or other reasons, check the ABV information and product labelling rather than assuming that kombucha contains zero alcohol.
Does the alcohol make kombucha taste alcoholic?
Not necessarily.
The alcohol naturally produced during kombucha fermentation is generally not what gives kombucha its familiar flavour.
Instead, you're more likely to notice the combination of:
Tea + acidity + botanicals + natural carbonation
That's what creates the refreshing, complex character of kombucha.
For example, Vesna's Energy combines ginger and lemon for a bright, zesty flavour, while Glow brings together hibiscus, rose and elderflower for a more floral profile.
The result is a sophisticated alternative to a conventional soft drink — without being designed to taste like beer, wine or spirits.
The simple answer
Does kombucha contain alcohol?
It can contain naturally occurring alcohol because it is fermented.
Is kombucha the same as an alcoholic drink?
No. Kombucha is a fermented tea beverage, and its alcohol content can be much lower than conventional alcoholic drinks.
Is all kombucha completely alcohol-free?
No. The amount varies, so don't assume that every kombucha contains zero alcohol.
How can I know how much is in a particular bottle?
Check the manufacturer's product information and labelling.
Does fermentation create alcohol naturally?
Yes. Yeasts can produce ethanol as part of fermentation.
A final thought from Vesna
We often talk about kombucha as a mindful alternative to alcoholic drinks and it can certainly be part of an alcohol-free or reduced-alcohol lifestyle.
But we think it's important to be honest about what we're making.
Kombucha is fermented tea.
It is alive, naturally complex and made through a process that takes time.
And that's part of what makes it so interesting.