Is Kombucha Alcoholic? What's Actually in the Bottle

Short answer: kombucha contains a trace amount of alcohol, because that's how fermentation works. But properly made commercial kombucha in Australia sits below 0.5% alcohol by volume, which is the level our food standards use as the line for labelling. For comparison, that's less than you'd find in some very ripe fruit or a glass of fresh orange juice that's been sitting around.

Here's the longer answer, because it's a question we get asked a lot, and the details matter if you're pregnant, driving, or avoiding alcohol for any reason.

Why kombucha contains any alcohol at all

Kombucha is made by fermenting sweetened tea with a culture of bacteria and yeast. The yeast eats the sugar and produces carbon dioxide (the bubbles) and a small amount of ethanol. The bacteria then convert most of that ethanol into the organic acids that give kombucha its signature tang.

That balance between yeast and bacteria is the whole craft of brewing kombucha. A well-managed ferment keeps alcohol at trace levels. A poorly managed one, or a bottle left warm for weeks, can keep fermenting and creep higher. This is why how your kombucha is brewed, stored and handled actually matters, and why we keep rok Kombucha refrigerated.

What Australian rules say

Australia's food standards draw the line at 0.5% ABV. From that point, a drink must carry labelling including alcohol content, and several states treat fermented drinks at or above 0.5% as alcoholic beverages for liquor licensing purposes.

The industry guidance from the Australian Beverages Council is blunt about the wider category: when fermented drinks on Australian shelves were surveyed a few years ago, a surprising number were found over the threshold without saying so. That's worth knowing as a shopper. A kombucha brand should be able to tell you where they sit and how they manage it.

For rok, the answer is simple: our kombucha is brewed to stay under 0.5% ABV, and we don't just assume it. We batch test every brew at multiple stages of fermentation, and again before bottling. If a batch isn't where it should be, it doesn't get bottled. Ask your favourite kombucha brand if they can say the same.

How much alcohol is that really?

Numbers help here. A standard drink in Australia is 10 grams of alcohol, which is what you get in a 285ml pot of full-strength beer at 4.8% ABV.

A 330ml bottle of kombucha at under 0.5% ABV contains less than 1.3 grams of alcohol, which is less than one seventh of a standard drink. You would need to drink more than seven bottles in quick succession to take in the alcohol of a single pot of beer, and your body processes trace amounts as you go.

That's why kombucha is sold in supermarkets next to the juice, not behind the bar.

Can I drink kombucha if I'm pregnant or breastfeeding?

This one deserves a careful answer rather than a sales pitch. Australian health guidance is that not drinking alcohol is the safest option during pregnancy and breastfeeding. Kombucha's alcohol content is trace, but it is not zero, and unpasteurised fermented drinks are also sometimes flagged for pregnant women for reasons beyond alcohol.

Our honest suggestion: talk to your GP or midwife, tell them the drink is a fermented tea under 0.5% ABV, and let them advise you for your situation. If you'd rather skip the ferment entirely, our Waves & Caves sodas are not fermented, so there's no alcohol question at all.

Can I drive after drinking kombucha?

For practical purposes, yes. The trace alcohol in a bottle of compliant kombucha is a fraction of a standard drink. It's the same category of exposure as eating very ripe fruit or using vinegar in a salad dressing.

One sensible note: if you're on a zero-tolerance licence and about to be tested, don't skol a bottle of any fermented drink seconds before. Mouth alcohol from any fermented product can briefly register before it dissipates. Give it a few minutes. Beyond that, kombucha and driving are not in conflict.

Is kombucha halal, or okay for people avoiding alcohol completely?

People avoid alcohol for religious, health and personal reasons, and they set their own lines. The facts to work with: kombucha contains trace alcohol as an unavoidable by-product of fermentation, it is not added, and the finished drink cannot make you intoxicated in any realistic quantity. Some religious authorities accept trace fermentation by-products on that basis, others don't. We'd rather give you the real numbers than a blanket reassurance, so: under 0.5% ABV, less than a seventh of a standard drink per bottle.

If your line is zero fermentation, the Waves & Caves range is the one for you.

What about our other drinks?

While we're here, a question we see in searches: is lemon lime bitters alcoholic? Traditional LLB made at the pub contains Angostura bitters, which is 44.7% ABV, so a classic pub LLB does contain a small amount of alcohol. Our Waves & Caves lemon lime bitters is a soft drink: no bitters spirit, no fermentation, no alcohol. Same goes for the rest of the Waves & Caves range 

The bottom line

• All kombucha contains trace alcohol from fermentation. Anyone who says theirs contains none isn't being straight with you.
• The Australian labelling line is 0.5% ABV, and rok is brewed to stay under it.
• One bottle is less than a seventh of a standard drink. It cannot make you intoxicated.
• Pregnant or breastfeeding: safest option per Australian guidance is to avoid alcohol, so ask your GP and consider our unfermented sodas instead.
• Driving is fine for practical purposes.

Got a question we haven't covered? Check our FAQ or get in touch, we're a small team in Margaret River and we answer our own emails.