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What is kombucha?

Kombucha is a mildly fizzy, fermented drink made from sweetened tea and a specific culture known as a ‘scoby’, short for a ‘symbiotic culture of bacteria and yeasts’. The bacteria and yeasts in the scoby convert the sugar into ethanol and acetic acid. The acetic acid is responsible for kombucha’s distinctive sour taste.

Discover our full range of health benefit guides and learn how to make your own kombucha at home. Also check out our top picks for the best kombucha to buy.

Nutritional profile of kombucha

An average 100ml portion provides:

  • 16kcals/67KJ
  • 0.0g protein
  • 3.0g carbohydrates
  • 3.0g sugar

Nutritional contributions will vary from product to product.

How do you make kombucha?

Kombucha is usually made using:

  • Sugar
  • Cold filtered water
  • Black or green tea (bags or loose leaf)
  • Scoby – purchased online, or from an existing batch of kombucha

To make kombucha, the tea and sugar is steeped in boiled water and left to cool before adding the scoby. This is covered and left to ferment for up to a week. The mixture is then poured into an airtight container with some extra sugar and left for a few more days – the longer it is left, the fizzier it will become. At this point, flavourings such as spices or fruit, can be added.

Read more about how to make kombucha.

What are the 5 main health benefits of kombucha?

1. Potential source of probiotics

Fermented foods such as yogurts, sauerkraut and kefir all contain live micro-organisms. As kombucha is the product of fermentation, a number of probiotic microbes are produced. At specific concentrations, these probiotic bacteria can help to balance levels of bacteria in the gut and improve digestion. However, to date, there have not been enough studies to confirm whether kombucha contains adequate amounts of these beneficial bacteria to be deemed an effective probiotic. Furthermore, amounts and strains of probiotic microbes will vary depending on differing factors, including how the kombucha is made and its fermentation time.

2. May be a source of antioxidants

Antioxidants are substances that protect the body from the oxidative damage caused by free radicals. Free radicals are a normal by-product of processes in the body, but the key is to minimise their impact by consuming food and drink rich in antioxidants. Tea, especially green tea, is rich in a group of antioxidants called polyphenols, especially catechins. However, there are a number of variables which may influence the antioxidant properties of kombucha, including the tea it was made from and the fermentation time.

3. May contribute vitamins and minerals

Kombucha contains small amounts of vitamins and minerals which are produced when the yeast breaks down the sugars, including vitamin C and the B group of vitamins such as B1, B6 and B12. Levels are likely to vary between products.

4. May be anti-fungal

One of the by-products of fermentation is acetic acid and it is thought this, as well as other compounds found in green and black tea, may suppress the growth of less desirable bacteria and yeast whilst promoting more beneficial strains.

5. May support heart health

Animal studies suggest consuming kombucha may improve cholesterol management and, in conjunction with the protective polyphenols in tea, especially green tea, may reduce the risk of developing heart disease.


Is kombucha safe for everyone?

Kombucha is classified as a functional food because of its potentially beneficial effect, when enjoyed as part of a varied and balanced diet; however, it may not be suitable for all people and there may be some risks.

Kombucha is not advised for pregnant or breastfeeding women, or those who have a compromised immune system. It is important to reiterate that there haven’t been many human clinical studies to prove its safety and efficacy. There have been some reports that drinking too much can lead to unpleasant side effects, such as stomach ache, nausea and dizziness. Prolonged fermentation is not recommended because of the accumulation of organic acids, which might reach harmful levels.

Fermented foods, including kombucha, are high in histamine, so those with a histamine intolerance should be wary that consuming kombucha may exacerbate symptoms.

Always check with your GP if you are concerned about introducing kombucha to your diet, or if you have any adverse side effects after consuming it.

More health benefits guides...

The health benefits of kefir
The health benefits of miso
The health benefits of apple cider vinegar

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Have you ever tried kombucha? Comment below and let us know.

Jo Lewin is a registered nutritionist (RNutr) with the Association for Nutrition with a specialism in public health. Follow her on Twitter @nutri_jo.


All health content on is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. If you have any concerns about your general health, you should contact your local health care provider. See our website terms and conditions for more information.

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