Is Kombucha Alcoholic? The UK 0.5% Line, Caffeine and Halal

Kombucha contains alcohol, because the yeast in the culture turns some of the tea's sugar into ethanol, but under UK licensing law a drink of 0.5% ABV or less at the point of sale is not "alcohol", and kombucha is sold as a soft drink on that basis.¹ What a bottle actually holds is another matter: in the largest survey, of 684 kombuchas sold in one Canadian province, the average was 0.77% ABV and 31.5% were above 1%; in Brazil, 60% of 30 brands labelled "up to 0.5%" measured above it; and no UK kombucha has been measured in a published study.^{6, 7} This page gives the law, the label descriptors, the measured surveys, why a live bottle can climb, what has been tested for the breathalyser question, the caffeine figures, and the facts behind the halal question. Which drinks carry live cultures, and what the trials show, are on what drinks have probiotics and the Wellgard probiotics guide.

Evidence at a glance

• The law: the Licensing Act 2003, section 191, excludes from "alcohol" any drink "of a strength not exceeding 0.5% at the time of the sale or supply in question"; the advertising code draws the same line, and a label must show the strength only above 1.2% ABV.^{1, 2, 3}
• The descriptors (England, 2018 guidance): "alcohol free" no more than 0.05% ABV, "de-alcoholised" no more than 0.5%, "low alcohol" 1.2% or below; written for alcohol substitute drinks, "not soft beverages".⁴
• Measured: Canada, 684 samples, mean 0.77% ABV, undetectable to 3.62%; Brazil, 30 brands, 60% above their 0.5% label; New Zealand, 9 products, mean 0.56% to 0.68%; Argentina, 10 products, mean 1.44%; United States, 9 products, 0% to 1.29%.^{6, 7, 8, 9, 10}
• Breath alcohol after kombucha: never measured; one study found alcohol markers in the urine of 83% of 12 people after a regular kombucha, none positive after the first day.¹⁴
• Caffeine: 15 to 113 mg a litre in nine US products, roughly 5 to 37 mg in a 330 mL bottle, against the NHS's 75 mg for a cup of tea.^{10, 16}

Sources checked on 2 November 2026.

Does kombucha count as alcohol in UK law?

Not if it is 0.5% ABV or less when it is sold.¹ The Licensing Act 2003, which governs the sale of alcohol in England and Wales, defines "alcohol" as "spirits, wine, beer, cider or any other fermented, distilled or spirituous liquor", then excludes "alcohol which is of a strength not exceeding 0.5% at the time of the sale or supply in question".¹ Kombucha, a fermented drink, falls within "any other fermented ... liquor", so everything turns on the number: at or below 0.5% when sold it is a soft drink; above it, it is alcohol and its retail sale is a licensable activity under section 1 of the Act. The test is "at the time of the sale or supply", not at bottling, which matters for a live drink. The advertising code uses the same line, defining alcoholic drinks as those "containing more than 0.5% alcohol" and low-alcohol drinks as "more than 0.5% and up to and including 1.2%", and food labelling law requires the alcoholic strength on a label only when the drink contains over 1.2% ABV.^{2, 3} So a kombucha label that says nothing about alcohol is not hiding anything the law requires it to show. It is also not telling you the figure.

What do "alcohol free", "de-alcoholised" and "low alcohol" mean on a UK label?

In England's guidance, "alcohol free" means no more than 0.05% ABV, "de-alcoholised" no more than 0.5%, and "low alcohol" 1.2% or below, and the guidance was written for drinks sold as substitutes for alcoholic ones, "not soft beverages".⁴ The Department of Health and Social Care published the descriptors on 13 December 2018, the day the labelling regulations that had carried them were revoked; their use is voluntary, "alcohol free" and "de-alcoholised" are reserved for a drink from which the alcohol "has been extracted", and the document states "This guidance is for England".⁴ Two consequences for kombucha. First, 0.05% is ten times stricter than the licensing line, so a kombucha that is lawful to sell as a soft drink is not "alcohol free" by this definition, and nothing has been extracted from it. Second, the guidance covers alcohol substitute drinks, meaning drinks packaged and sold as a direct replacement for the alcoholic drink they resemble (the test in regulation 9 of the Soft Drinks Industry Levy Regulations 2018), so it does not govern a kombucha sold as a tea or soft drink; what applies is the general rule that a label must not mislead, enforced by local trading standards.⁴ A consultation on changing the descriptors ran from 28 September to 23 November 2023 and, as of 2 November 2026, shows no published outcome, so the 2018 figures stand.⁵ If a kombucha label says "alcohol free", "non-alcoholic" or "less than 0.5%", the three mean different things, and only the last is a number.

How much alcohol is in a bottle of kombucha?

Usually under 1% ABV, sometimes more than the label says, and in a few bottles as much as beer, on the surveys that have measured it, the five that report their figures are below; none is British.^{6, 7, 8, 9, 10} Each survey as it reported:

For scale, a UK unit is 10 mL of pure alcohol.¹³ A 330 mL bottle at exactly 0.5% ABV holds 1.65 mL of ethanol, about a sixth of a unit; at the Canadian average of 0.77%, a quarter of a unit; at the Canadian maximum of 3.62%, 12 mL, a little over one unit, which is the alcohol in a half pint of 4% beer.^{6, 13} The kombucha brewed for one 2023 clinical trial measured 1.5% ethanol, so a research drink can sit above the line as readily as a shop one.¹¹ The spread exists because the yeast keeps working after bottling if the drink is alive and warm. A 2021 laboratory method study puts it plainly: raw kombucha "if kept at temperatures above 4 °C" may "continue to ferment, producing ethanol", so a bottle below 0.5% at production can be above it when drunk.¹² The New Zealand brewers interviewed for their survey named the other causes: a high starting sugar load, fruit or juice added after fermentation, and loose control of pH, temperature and testing.⁸ A pasteurised kombucha has been heat-treated, which stops its cultures, so its alcohol has nothing to raise it after bottling.

Why do I feel buzzed after drinking kombucha?

No study has measured how people feel after drinking kombucha, so the answer has to be built from what a bottle contains: a little alcohol, some caffeine, sugar, acid and fizz.^{6, 10} The alcohol and caffeine figures above put a typical bottle at a fraction of a unit and at most half a cup of tea's caffeine.^{6, 10, 13, 16} The sugar varies with the brew and the label states it, and a cold, sour, fizzy drink taken quickly has an effect of its own that owes nothing to ethanol. Which of these is "the buzz" has not been tested. What the surveys do show is that two bottles of the same brand can differ, and that the bottle left out of the fridge is the one most likely to have climbed.^{6, 8, 12} If a particular kombucha reliably makes you light-headed, treat that bottle as the drink it is behaving like.

Will I fail a breathalyser after kombucha, and am I still sober?

No study has measured breath alcohol after kombucha, so nobody can tell you that you would pass a breath test; the one exposure study found alcohol markers in urine on the day of drinking, none the next day.¹⁴ The drink-drive limit in England, Wales and Northern Ireland is 35 micrograms of alcohol per 100 mL of breath, or 80 mg per 100 mL of blood; in Scotland it is 22 micrograms and 50 mg.¹⁵ Against that, the arithmetic above gives a fraction of a unit per bottle, and the NHS puts one unit at "around the amount of alcohol the average adult can process in an hour", adding that "this will vary from person to person".¹³ That arithmetic is all there is; it is not a measurement. What has been measured matters if you are tested for abstinence rather than impairment. In a 2022 study, 12 adults drank a regular commercial kombucha within 20 minutes and gave every urine sample for 12 hours; the alcohol metabolites ethyl glucuronide and ethyl sulfate appeared in the urine of 83% of them within the first five samples, at median levels of 830 and 240 ng/mL, above the screening cut-offs the laboratory used; neither marker was positive after the first day, and oral fluid stayed negative.¹⁴ Seven others drank a "hard" kombucha, the kind made and sold as an alcoholic drink, and all seven were positive in urine.¹⁴ So a regular kombucha can show on a urine alcohol-marker test on the day it is drunk, and was clear by the next day's first sample in that study, which matters for workplace, medical or court monitoring that uses those markers; whether it registers on a roadside breath test has not been studied. If you drive for a living or are tested for abstinence, that is the fact to act on. How long does alcohol stay in your system covers the clearance figures.

Does kombucha have caffeine?

Yes: in the nine US products measured, caffeine ran from 15 to 113 mg a litre, so a 330 mL bottle carried roughly 5 to 37 mg, against the NHS's 75 mg for a cup of tea and 100 mg for a cup of instant coffee.^{10, 16} The caffeine comes from the tea, so the amount depends on the tea base, how strongly it was brewed and what was added afterwards; the highest product in that study listed a green coffee bean extract among its ingredients.¹⁰ UK labelling law requires the words "High caffeine content. Not recommended for children or pregnant or breast-feeding women" on a drink with more than 150 mg of caffeine a litre, a level no product in that survey reached, and the rule does not apply where "tea" or "coffee" is in the name of the drink; the same 150 mg threshold applies to a dried drink that would reach it once made up.³ If caffeine keeps you awake, caffeine and sleep gives the half-life arithmetic.

Is kombucha halal?

UK food law has no definition of halal, so this page can only state the facts a ruling rests on: kombucha contains ethanol made by fermentation, usually below 1% ABV and sometimes above its label, and UK law treats a drink of 0.5% ABV or less at the point of sale as not alcohol.^{1, 6, 7} The ethanol is not added; the yeast produces it from the sugar, and the amount in any bottle depends on the brew and the storage, which is why the surveys differ so widely.^{6, 8, 12} Scholars and certifying bodies differ on whether, and at what level, ethanol produced by fermentation in a food is permissible, so a bottle may be certified by one body and not by another, and a certification mark on a label tells you which standard it met. If the question matters to you, the measured ranges above and the law are the facts to take to your own scholar or certifying body. A food page cannot settle it, and this one does not try.

Who should take care with kombucha?

Pregnant women, and babies and young children, on the NHS's wording.^{16, 17, 18} The NHS says that "if you're pregnant or planning to become pregnant you should not drink alcohol", and on its foods-to-avoid page that "it's safest to avoid alcohol" and that you "should not have more than 200mg of caffeine a day"; no NHS page covers kombucha itself, so whether a drink at or below 0.5% ABV falls within that advice is a question for your midwife.^{16, 17} The NHS says "tea and coffee are not suitable for babies or young children", and kombucha is a tea with a little alcohol in it.¹⁸ Who else should not drink kombucha, including anyone with a weakened immune system, is on is kombucha good for you.

What we don't know

• Whether any UK kombucha is above 0.5% on the shelf: no published measurement of a UK product exists (literature searched to 2 November 2026); the published surveys are Canadian, Brazilian, New Zealand, Argentine, American, Estonian and Uruguayan.^{6, 7, 8, 9, 10, 19, 20}
• Whether kombucha registers on a breath test, or how people feel after it: not measured; the one exposure study measured urine and oral fluid markers in 19 people.¹⁴
• We found no published measurement of the alcohol or caffeine in a dried or powdered kombucha sold as a drink, so for those the label is the figure (literature searched to 2 November 2026).
• Whether England's "alcohol free" descriptor will move: the 2023 consultation has no published outcome.⁵

Frequently asked questions

Is kombucha tea or alcohol?

Both, in the plain sense: it is sweetened tea fermented by yeasts and bacteria, and the fermentation leaves some ethanol behind. In UK law it is alcohol only if it exceeds 0.5% ABV when sold; at or below that it is a soft drink.¹

Can you get drunk on kombucha?

Not at the measured averages; a bottle from a warm, over-fermented batch can reach beer strength, so several of those are a different proposition.⁶

Can Muslims drink kombucha?

Rulings differ between scholars and certifying bodies, and no UK regulator sets the test; the facts are that kombucha contains ethanol from fermentation, at survey averages in the surveys above, where reported, of 0.56% to 1.44% ABV and single bottles from undetectable to 3.62%, and that UK law treats 0.5% or less at sale as not alcohol.^{1, 6, 8, 9} Take those figures to your own authority.

Sources

1. Licensing Act 2003, section 191, meaning of "alcohol": excludes "alcohol which is of a strength not exceeding 0.5% at the time of the sale or supply in question". England and Wales. legislation.gov.uk. Section 1 makes the sale by retail of alcohol a licensable activity: legislation.gov.uk. The Licensing (Scotland) Act 2005, section 2, and the Licensing (Northern Ireland) Order 1996, article 2, draw the same 0.5% line at the time of sale: legislation.gov.uk, legislation.gov.uk.
2. Committee of Advertising Practice. The CAP Code, section 18, Alcohol: alcoholic drinks defined as "containing more than 0.5% alcohol", low-alcohol drinks as "more than 0.5% and up to and including 1.2%". asa.org.uk.
3. Department for Environment, Food and Rural Affairs and Food Standards Agency. Food labelling: giving food information to consumers. Last updated 20 September 2022. Alcoholic strength required on drinks over 1.2% ABV; the caffeine warning on drinks over 150 mg a litre, with the tea and coffee exemption. gov.uk.
4. Department of Health and Social Care. Low alcohol descriptors guidance. Published 13 December 2018. Voluntary guidance for England on alcohol substitute drinks: low alcohol 1.2% ABV or below, alcohol free no more than 0.05%, de-alcoholised no more than 0.5%. gov.uk. Alcohol substitute drink as defined in regulation 9 of the Soft Drinks Industry Levy Regulations 2018: legislation.gov.uk.
5. Office for Health Improvement and Disparities. Updating labelling guidance for no and low-alcohol alternatives. Consultation, 28 September to 23 November 2023; no outcome published as of 2 November 2026. gov.uk.
6. Jang SS, et al. Ethanol concentration of kombucha teas in British Columbia, Canada. Journal of Food Protection, 2021. Composition survey, 684 samples from retail venues and processors, headspace gas chromatography-mass spectrometry; funding not stated in the record. PubMed 34143179.
7. da Silva GF, Botelho BG. Simultaneous quantification of alcoholic content and acidity in Brazilian commercial kombuchas by FTIR spectroscopy and chemometric analysis. Journal of Food Science, 2025. Composition survey and method validation, 30 brands, infrared spectroscopy against gas chromatography; funded by Brazilian public research agencies, no conflicts declared. PubMed 40754655.
8. Nordstrom K, et al. Comparing Alcolyzer and GC-FID for ethanol measurement in kombucha: insights from nutritional labeling and brewer practices in New Zealand. Journal of Food Science, 2026. Composition survey and method comparison, 9 products tested and 35 labels read, with brewer interviews; funding not stated in the record. PubMed 41536259.
9. Moccia T, et al. First characterization of kombucha beverages brewed in Argentina: flavors, off-flavors, and chemical profiles. International Journal of Food Science, 2024. Composition survey, 10 products, liquid chromatography; the authors state they received no specific funding and declare no conflicts. PubMed 39963578.
10. Yang J, et al. Microbial and chemical profiles of commercial kombucha products. Nutrients, 2022. Composition survey, 9 US products, liquid chromatography for caffeine and gas chromatography for ethanol; funded by an unrestricted educational grant from a kombucha maker, one author on its scientific advisory board. PubMed 35277029.
11. Mendelson C, et al. Kombucha tea as an anti-hyperglycemic agent in humans with diabetes: a randomized controlled pilot investigation. Frontiers in Nutrition, 2023. Randomised double-blind crossover pilot, 12 adults with type 2 diabetes, 240 mL a day for 4 weeks per arm; the study kombucha measured 1.5% ethanol; two authors hold interests in a synbiotics company and the drinks were donated by a kombucha maker. PubMed 37588049.
12. Ivory R, et al. Determination of ethanol concentration in kombucha beverages: single-laboratory validation of an enzymatic method. Journal of AOAC International, 2021. Laboratory method validation on 8 commercial kombuchas bought in Ireland; the authors are employed by the test kit's maker. PubMed 33291146.
13. NHS. Alcohol units. Page last reviewed 27 August 2024. One unit is 10 mL or 8 g of pure alcohol. nhs.uk.
14. Li SY, et al. Evaluation of alcohol markers in urine and oral fluid after regular and hard kombucha consumption. Journal of Analytical Toxicology, 2022. Human exposure study, 19 adults (12 regular kombucha, 7 hard kombucha), one drinking session with 48 hours of sampling; funding not stated in the record. PubMed 35953454.
15. GOV.UK. The drink drive limit. 35 micrograms per 100 mL of breath and 80 mg per 100 mL of blood in England, Wales and Northern Ireland; 22 micrograms and 50 mg in Scotland. gov.uk.
16. NHS. Foods to avoid in pregnancy. Page last reviewed 15 June 2026. Caffeine: no more than 200 mg a day, 100 mg in a cup of instant coffee, 75 mg in a cup of tea; alcohol: "it's safest to avoid alcohol". nhs.uk.
17. NHS. Drinking alcohol while pregnant. Page last reviewed 13 March 2023 (review overdue). nhs.uk.
18. NHS. Drinks and cups for babies and young children. Page last reviewed 5 October 2022 (review overdue). "Tea and coffee are not suitable for babies or young children." nhs.uk.
19. Andreson M, et al. Characterisation of chemical, microbial and sensory profiles of commercial kombuchas. International Journal of Food Microbiology, 2022. Composition survey, 16 commercial kombuchas from 6 producers in Estonia, metabolite and metagenomic profiling; ethanol among the dominant metabolites, no figure given in the record; funding not stated in the record. PubMed 35567890.
20. Tourné F, et al. Commercial kombucha beverages produced in Uruguay: physicochemical composition and antioxidant profile. Journal of the Science of Food and Agriculture, 2026. Composition survey, 8 commercial kombuchas, several above the local non-alcoholic threshold, no figure given in the record; funded by Uruguayan public research agencies. PubMed 41839755.

General information, not medical advice. Kombucha is a food; if you are pregnant, drive for a living, are tested for alcohol, or have a condition that affects your immune system, take the figures above to your midwife, GP or pharmacist. If a drink makes you unwell, report it to your local authority's food safety team.

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