What is kombucha? Everything you need to know in 5 key points

What is kombucha ? It's a lightly sparkling fermented beverage obtained by fermenting sweetened tea using a symbiotic culture of bacteria and yeast called a SCOBY. What exactly is kombucha? It's a question millions of French people have been asking themselves since this ancient drink flooded organic aisles and supermarkets. What exactly is kombucha, what does it contain, and why all the hype? Here's the complete, factual, and uncompromising guide.

• ✅ What is kombucha : a fermented drink rich in natural probiotics beneficial for the gut microbiota
• ✅ Source of organic acids, B vitamins and antioxidants from tea
• ✅ Consumed for over 2,000 years in East Asia — nicknamed "the elixir of immortality"
• ✅ Low alcohol content (<0.5%) and naturally acidic
• ✅ A serious alternative to sugary sodas: 5 times less sugar than a regular soft drink

According to a Nielsen study (2023), the global kombucha market exceeds $3 billion with an annual growth rate of 25%. Kombucha represents one of the strongest trends in functional nutrition today.

What is kombucha? Definition and origins

What exactly is kombucha? It's an ancient brew that originated in China around 220 BC, during the Qin dynasty, where it was known as the "elixir of immortality" or "tea of ​​long life." Its name is believed to come from the Japanese words "kombu" (seaweed) and "cha" (tea). The beverage then spread to Russia, Eastern Europe, and finally throughout the world during the 20th century.

What exactly is kombucha? This fermented tea is made by immersing a SCOBY (Symbiotic Culture Of Bacteria and Yeast) in sweetened tea. Over 7 to 14 days, microorganisms transform the sugar into organic acids, carbon dioxide, and a small amount of alcohol (usually less than 0.5%). The result is a lightly sparkling beverage with a tangy, fruity taste.

What is it about kombucha that distinguishes it from industrial sodas? The total absence of artificial colors, its richness in natural bioactive compounds, and its residual sugar content of only 3 to 8g/100ml — compared to 10 to 12g/100ml for classic sodas.

What is kombucha? The central role of the SCOBY

The SCOBY is the foundational element of kombucha. It is a gelatinous mass, often compared to a jellyfish, made of bacterial cellulose. Inside, acetic and lactic acid bacteria, as well as wild yeasts, live in symbiosis.

These microorganisms work together to transform sweetened tea into kombucha:

• Yeast first breaks down sucrose into glucose and fructose, then produces ethanol
• The bacteria then convert this ethanol into acetic acid — which gives the drink its characteristic tangy taste
• Additional organic acids (gluconic, glucuronic, lactic) are gradually formed

The SCOBY reproduces with each fermentation by forming a "baby SCOBY" on the surface. This allows you to share the culture, store it, or use it to start a new batch.

What is kombucha? Its detailed nutritional composition

What exactly does kombucha offer? Here is the composition of a standard 240ml serving:

The exact concentration varies depending on the type of tea used, the fermentation time, the temperature, and the SCOBY strain. Kombucha fermented for 7 days will be milder; fermented for 14 days, more acidic and richer in organic acids.

What is kombucha according to the type of tea? What the competition doesn't tell you

How does kombucha change radically depending on the tea used — and this is a point that most articles ignore:

• Black tea: the most common. It has the most studied probiotic profile, a pronounced, slightly vinegary taste, and moderate caffeine (~15mg/240ml). Ideal for beginners.
• Green tea: richer in EGCG (epigallocatechin gallate), a powerful antioxidant. Milder, herbaceous taste. Preferred by those seeking a stronger anti-inflammatory effect.
• White tea: the most delicate, the richest in antioxidants, the least processed. Gentle fermentation, floral taste. Ideal for sensitive palates.
• Jun kombucha: a variant with green tea and honey (not vegan). A more delicate flavor profile, faster fermentation.
• Rooibos tea: caffeine-free, rich in minerals. An ideal option for people sensitive to caffeine or those wishing to enjoy kombucha in the evening.

What's the best kombucha for you? If you're looking for maximum antioxidants: green or white tea. If you're a beginner: black tea. If you're avoiding caffeine: rooibos.

What is kombucha? Its scientifically documented benefits

What are the health benefits of kombucha? Here are the effects best documented by scientific literature:

1. Supporting the gut microbiota

What does kombucha do for the gut microbiota? It provides live probiotics that colonize the colon and strengthen the balance of the gut flora. A study published on PubMed (2021) showed that regular consumption of fermented beverages improves gut microbial diversity—a key factor in overall health.

2. Antioxidant properties

The polyphenols in tea are partially preserved after fermentation. These antioxidants neutralize free radicals responsible for cellular aging and chronic diseases. Fermentation even increases the bioavailability of certain polyphenols—an advantage absent in unfermented tea.

3. Potential hepatoprotective effect

Studies in animal models suggest that the glucuronic acid in kombucha supports liver function by facilitating the elimination of toxins. Human research is still needed to confirm this effect.

4. Antimicrobial activity

Acetic acid and bacteriocins produced during fermentation exert an inhibitory effect on certain pathogens such as E. coli, Salmonella and Candida albicans, according to several in vitro studies.

5. Blood glucose regulation

A Harvard Health publication discusses the potential of kombucha to slow carbohydrate absorption and moderate postprandial blood sugar spikes, particularly in people at risk of type 2 diabetes.

6. Energy and vitality

What does kombucha provide in terms of energy? Its B vitamins (B1, B2, B6, B12) are directly involved in cellular energy production and the proper functioning of the nervous system. The slight residual caffeine (~15mg/240ml) provides a gentle energizing effect, without the caffeine spikes of coffee.

What does kombucha do for the skin? The gut-skin axis explained

What the competition doesn't detail: what kombucha brings to the skin via the gut-skin axis — one of the most active research areas in functional dermatology.

The gut microbiota and the skin microbiota communicate constantly via the immune and nervous systems. An imbalance in the gut microbiota (dysbiosis) often manifests as skin problems: acne, redness, eczema, and a dull complexion. By rebalancing the gut microbiota, kombucha indirectly but effectively improves skin quality

• Reduction of systemic inflammation — the main trigger of inflammatory acne
• Improved absorption of essential nutrients for the skin (zinc, vitamin C, omega-3)
• The antioxidant polyphenols in tea protect fibroblasts against oxidative stress — a factor in premature skin aging
• Glucuronic acid supports the elimination of toxins that accumulate in the skin

Results on the skin are usually noticeable after 4 to 8 weeks of regular consumption of 200–300ml per day.

What is kombucha for athletes?

What does kombucha offer to people who engage in regular physical activity? This is another angle that the competition completely ignores:

• Before exercise: the mild caffeine (~15mg/240ml) provides a gentle, natural pre-workout, without disrupting sleep if consumed in the morning.
• After exercise: antioxidant polyphenols neutralize free radicals produced during intense exertion — reducing oxidative muscle damage
• Recovery: Vitamins B1, B2, and B6 support energy metabolism and muscle recovery
• Hydration: an alternative to sugary recovery drinks — kombucha hydrates while providing natural electrolytes

Kombucha after exercise is now recommended by many performance nutritionists. For athletes, the combination of kombucha (post-workout antioxidants) and milk kefir (protein and probiotics in the morning) is optimal. Check out our kombucha vs. kefir to choose the one that best suits your needs.

What is kombucha? How is it made?

Kombucha production always follows the same basic protocol:

1. Tea preparation: Infuse black or green tea in boiling water for 10 minutes.
2. Adding sugar: dissolve 80 to 100g of sugar per liter of tea
3. Cooling: Allow to cool to room temperature (below 30°C)
4. Inoculation: add the SCOBY and 10% of kombucha from the previous batch (starter liquid)
5. Primary fermentation: cover with a breathable fabric and let ferment for 7 to 14 days at 20–25°C
6. Bottling: filter and bottle for optional secondary fermentation (carbonation + aromas)

The cost of making homemade kombucha is €0.30 to €0.50 per liter — compared to €4 to €8 per 330ml bottle in stores. Over a year, the difference is considerable.

What is kombucha? The different varieties available

What is kombucha in its different forms?

• Classic black tea kombucha: the most common, with a strong and slightly vinegary taste
• Green tea kombucha: milder, richer in catechins, slightly herbaceous
• Jun kombucha: a fermented variant with honey and green tea, more delicate — not vegan
• Flavored kombucha: infused with fruit, ginger, and lavender during secondary fermentation
• Pasteurized kombucha: stabilized industrial version — less rich in live probiotics, to be avoided
• Raw kombucha: unpasteurized, contains the maximum number of active microorganisms — the preferred option

To benefit from the probiotic effects, what is the ideal kombucha? Always unpasteurized, kept in the refrigerator, with a slight natural turbidity at the bottom of the bottle.

What is kombucha? The optimal weekly treatment protocol

What is kombucha as a detox? Competitors never provide a precise protocol. Here is the one that nutritionists specializing in fermented foods recommend:

• Week 1: 100ml per day after lunch — allow the microbiota to adapt
• Week 2: 150–200ml per day, in two doses (midday and afternoon)
• Week 3: 200–300 ml per day as tolerated — this is the ideal maintenance dose
• Week 4 and beyond: 300ml per day for a minimum 8-week course for profound effects on the microbiota

If you experience bloating when you first start using it, this is normal: your gut microbiota is adapting. Reduce the dose and increase it more gradually.

What is kombucha? How and when should it be consumed?

What is the right time to consume kombucha? The drink is best served cold:

• Before or during meals to stimulate the production of digestive juices
• After physical exertion , for free radical-fighting antioxidants
• In the middle of the day to enjoy the mild caffeine without disrupting sleep
• Avoid in the evening if you are sensitive to caffeine — opt for caffeine-free fruit kefir in the evening.

What is kombucha as a substitute for sodas? This is one of its most immediate and impactful applications: replacing a can of soda (35g of sugar, 0 probiotics, 0 antioxidants) with 330ml of kombucha (8–10g of sugar, live probiotics, antioxidants from tea).

Precautions and contraindications to be aware of

Despite its many advantages, what problems can kombucha present in certain cases?

• Pregnant and breastfeeding women: not recommended — residual alcohol and lack of sufficient clinical studies
• Immunocompromised individuals: risk of infection by uncontrolled microorganisms, particularly in homemade preparations
• People with candidiasis: the yeast present can worsen some cases — consult your doctor
• People sensitive to caffeine: the base tea contains caffeine, even after fermentation (~15mg/240ml)
• For diabetics on medication: residual sugar content varies by brand — read the labels
• Active acid reflux (GERD): Kombucha is acidic (pH 2.5–3.5) and carbonated—not recommended during an attack. Milk kefir is preferable. See our guide on kefir and acid reflux.
• People taking anticoagulants: organic acids may interact with certain medications

ANSESrecommends moderate consumption and advises against homemade kombucha for vulnerable populations due to the risk of contamination if hygiene rules are not strictly followed.

What is kombucha? Its place on the French market

In France, the kombucha market exploded between 2018 and 2024. Today, you can find kombucha in supermarkets, organic stores, delicatessens and online.

The average price of a 330ml bottle is between €3 and €5 for premium unpasteurized versions. Homemade versions cost around €0.30 to €0.50 per liter—a saving of over 90%. Projections indicate that France will become one of the top five European markets for kombucha by 2027.

What is kombucha? How to choose the best one in a store?

With so many different brands available, what constitutes quality kombucha? Here are 5 criteria to check:

1. Unpasteurized: the label "raw" or "live" guarantees the presence of active probiotics
2. Sugar content: less than 5g of sugar per 100ml is a good indicator of complete fermentation
3. Short ingredient list: tea, water, sugar, SCOBY — avoid artificial flavors and preservatives
4. Keep refrigerated: a live kombucha must absolutely be refrigerated.
5. Alcohol content: less than 0.5% for standard versions

Good commercial kombucha should have a slight vinegar smell and a natural cloudiness at the bottom—a sign of active microbial life. Avoid overly clear and odorless versions.

What is kombucha vs. kefir: the real differences

How does kombucha compare to kefir? Key differences:

• Base: Kombucha uses tea; kefir uses milk or sweetened water
• Probiotics: 5–10 strains for kombucha vs. 40–60 strains for kefir — kefir is by far the most prevalent.
• Antioxidants: high in kombucha (tea polyphenols); low in kefir — kombucha predominates
• Caffeine: present in kombucha (~15mg/240ml), absent in kefir
• Calcium: high in milk kefir (300mg/250ml), absent in kombucha
• Fermentation time: 7–30 days for kombucha vs. 24–48 hours for kefir

The two drinks complement each other. The optimal strategy: kombucha for antioxidants and energy, kefir for probiotics and calcium. Discover our complete guide: kombucha or kefir: which to choose?

Frequently asked questions about what kombucha is

Is kombucha alcoholic?

Yes, but only a very small amount. Kombucha naturally produces ethanol during fermentation, but the content is usually less than 0.5% in standard commercial versions. Always check the label if you are sensitive to alcohol.

Is it safe to drink kombucha every day?

Yes, moderate daily consumption of 150 to 300 ml is generally well tolerated by healthy adults. Start with small amounts to allow your gut microbiota to adjust. Excessive consumption may cause digestive upset or excessive acidity.

Does kombucha help you lose weight?

How can kombucha aid weight loss? It's not a weight-loss product, but it can support a weight-loss program by replacing sugary sodas, improving digestion, and regulating blood sugar. It should be used as part of a balanced diet.

What are the benefits of kombucha for the skin?

Thanks to its antioxidants and support for the gut microbiota, kombucha can indirectly improve skin radiance via the gut-skin axis. A balanced microbiota reduces systemic inflammation often associated with acne and redness. Visible results require 4 to 8 weeks of regular consumption.

Does kombucha contain gluten?

No, kombucha made with tea, water, sugar, and a SCOBY is naturally gluten-free. However, check for flavored versions. People with celiac disease can usually consume it without any problems.

How to store homemade kombucha?

Homemade kombucha can be stored in the refrigerator in airtight glass bottles for 1 to 3 months. The cold slows down fermentation but doesn't stop it. The longer it ages, the more acidic it becomes. The SCOBY (SCOBY) should be stored separately in kombucha starter.

Is kombucha good for the liver?

Studies in animal models suggest a hepatoprotective effect linked to glucuronic acid. These results are promising but have not been confirmed by large-scale human clinical trials. If you have liver disease, consult your doctor before use.

Is it safe to give kombucha to a child?

Caution is advised. The alcohol content, high acidity, and caffeine make kombucha for children under 12. For children, fruit kefir is a better choice—it contains no significant amount of caffeine or alcohol. See our guide on kombucha or kefir for children.

What is the difference between commercially produced kombucha and homemade kombucha?

Commercially available kombucha is often pasteurized, which destroys some of the probiotics. Homemade, unpasteurized kombucha is richer in live microorganisms. What is the ideal kombucha? Homemade, provided strict hygiene rules are followed.

Is kombucha suitable for vegans?

Yes, kombucha is 100% vegan. No animal-derived ingredients are used in its standard composition. Only Jun kombucha (with honey) is not vegan.

What does kombucha offer in cases of chronic fatigue?

How does kombucha combat fatigue? Its B vitamins (B1, B2, B6, B12) are directly involved in cellular energy production. Some consumers report an improvement in their energy levels after several weeks of regular consumption. These effects do not replace a medical evaluation in cases of persistent fatigue.

Is kombucha halal?

What is kombucha in the context of a halal diet? Kombucha is generally considered halal because the alcohol is produced naturally through fermentation and is not toxic to the body in these quantities. However, opinions differ among religious authorities—consult an imam or other qualified authority if you have any doubt.

What makes kombucha different from yogurt?

What is the difference between kombucha and yogurt? Kombucha is lactose-free, contains antioxidants from tea, and organic acids that are absent in yogurt. Yogurt is richer in protein and calcium. Both are complementary in a varied fermented diet.

What can kombucha specifically offer athletes?

What are the benefits of kombucha for athletes? Before exercise, its mild caffeine provides a natural energy boost. After exercise, its antioxidant polyphenols neutralize free radicals produced during intense activity. Its B vitamins support muscle recovery. It's one of the best natural recovery drinks available.

Key takeaways

What is kombucha ? It's much more than just a trendy drink. What is kombucha ? It's a living fermented food, rich in probiotics, organic acids, and antioxidants, whose benefits for digestive, immune, and energy health are increasingly being documented by science.

What is kombucha? It remains one of the most complete solutions for naturally supporting your microbiota, provided you choose unpasteurized kombucha, consume it in moderation according to the progressive protocol, and adapt your consumption to your state of health.

To delve deeper, compare it with its counterpart: kombucha or kefir—which one to choose based on your profile? And if you want to maximize your probiotic intake, discover the health benefits of kefir.

Studies and scientific sources

• Jayabalan R. et al. (2014). A Review on Kombucha Tea — PubMed
• Kapp JM et al. (2019). Kombucha: a systematic review of the empirical evidence — PubMed
• Wastyk et al. (2021) — Gut-microbiota-targeted diets modulate human immune status. cell
• Harvard Health Publishing — Is kombucha good for you?
• National Center for Complementary and Integrative Health (NCCIH) — Kombucha Tea
• ANSES — Opinions and recommendations on kombucha