Kombucha is a fermented tea made by adding a live culture — known as a SCOBY (Symbiotic Culture of Bacteria and Yeast) — to sweetened, brewed tea. The SCOBY feeds on the sugar in the tea, fermenting it over a period of days to produce a naturally sparkling, tangy, and slightly sweet beverage.

Genuine kombucha is raw, unpasteurised, and alive with beneficial microorganisms. It is not a juice, a soft drink, or sparkling water with added flavouring. It is a fermented product — in the same category as yoghurt, kefir, kimchi, and miso — where the transformation caused by live cultures is precisely what defines the product.

SCOBY stands for Symbiotic Culture of Bacteria and Yeast. It is a rubbery, cellulose-based mass that houses the live bacteria and yeast responsible for fermentation. The bacteria and yeast in a SCOBY are interdependent — the by-products of yeast fermentation feed the bacteria, and vice versa.

A well-maintained SCOBY, cultivated over time and passed from batch to batch, is the biological engine of authentic kombucha. Every batch of kombucha grows a new SCOBY layer. It cannot be replicated by adding vinegar or an acidulant to tea — the biological activity of a live SCOBY is what produces the full profile of organic acids, live cultures, and natural carbonation that defines a genuine product.

Kombucha has a history spanning over 2,000 years. Its origins are traced to Northeast China, from where it spread across Central Asia, Russia, and eventually the rest of the world. It has long been consumed as a traditional health tonic and is now one of the fastest-growing functional beverage categories globally.

In Singapore, kombucha has grown significantly in visibility over the past decade. The local market now includes a range of brands — from small-batch craft producers to commercially produced drinks that adopt the kombucha label while taking shortcuts in the production process.

Authentic kombucha is brewed in two fermentation stages:

• First Fermentation (1F): Brewed tea is combined with sugar and a SCOBY. The mixture ferments for 7–14 days in a vessel at room temperature, producing the kombucha base — acidic, complex, and lightly effervescent.
• Second Fermentation (2F): The kombucha is bottled with natural flavouring ingredients — fresh fruits, herbs, botanicals. The sealed bottles ferment for a further 2–4 days, deepening the flavour and producing natural carbonation as the live cultures continue to work in the sealed environment.

The entire process from start to bottle typically takes 10–16 days. Brands that skip the second fermentation and add carbonated water instead are producing a fundamentally different product.

Authentic kombucha has a distinctive flavour that is tangy, lightly effervescent, and complex — with a balance of tartness from organic acids and residual sweetness from unfermented sugars. The carbonation is fine and integrated rather than sharp and aggressive.

The exact flavour varies by tea base, flavouring ingredients, and fermentation duration. A longer fermentation produces a more tart, vinegary result. A shorter fermentation produces a sweeter, milder drink. Natural batch variation is a hallmark of authentic artisanal kombucha.

Commercial versions — produced with added carbonated water and flavouring — tend to taste more uniformly sweet and fizzy, closer to a flavoured sparkling drink than a fermented product.

No — they are fundamentally different products. Kombucha is a fermented product where the carbonation, acidity, and live cultures are all produced naturally by the fermentation process. Sparkling water with added probiotics is a manufactured drink where these elements are added separately as ingredients.

The distinction matters because the bioactive compounds in genuine kombucha — organic acids, enzymes, B vitamins — are by-products of fermentation. They cannot be replicated by adding probiotic capsules to sparkling water. A drink that resembles kombucha in appearance and taste but was not produced by genuine fermentation is a different product, regardless of what the label says.

Kombucha is a living product and natural variation between batches is expected and normal. Factors that influence flavour include seasonal temperature changes, the composition and age of the SCOBY, tea quality and origin, fruit ripeness and freshness, and fermentation duration.

Slight differences in tartness, sweetness, or fizziness are entirely normal and are a hallmark of authentic, artisanal kombucha. A product that is perfectly identical in every bottle and every batch has typically had the variable, living elements of genuine fermentation replaced or controlled out of the process.

Floating strands or jelly-like pieces are SCOBY bits — edible, nutritious, and completely harmless. They are a sign of a living, active brew and one of the clearest visual indicators that a kombucha is genuinely fermented. You can sift them out if you prefer a cleaner pour, or drink them as they are.

Cloudy sediment at the bottom of the bottle contains raw enzymes and live cultures. Gently swirl the bottle before drinking to redistribute it, or let it settle and pour carefully. Neither the floating pieces nor the sediment are defects — they are evidence of a genuine product.

Genuinely fermented, unpasteurised kombucha contains a range of bioactive compounds formed during fermentation — organic acids, antioxidants, B vitamins (B1, B6, B12), vitamin C, enzymes, and live probiotic cultures. Research suggests potential benefits across several areas:

• Gut health: Live probiotics and organic acids may promote beneficial gut bacteria, aid digestion, and reduce bloating.
• Antioxidant activity: Rich in polyphenols from the tea base that help neutralise free radicals and reduce oxidative stress.
• Immune support: A healthier gut microbiome is associated with improved immune function.
• Gentle energy: Naturally forming B vitamins, trace iron, and small amounts of caffeine offer a mild, sustained energy lift.

Yes — sugar is an essential ingredient, as the SCOBY requires it to ferment. However, a significant portion of the sugar is consumed by the live cultures during fermentation, leaving only a residual amount in the finished drink.

Well-fermented authentic kombucha typically contains 2–4g of sugar per 100ml — significantly less than fruit juice (10–12g) or soft drinks (8–11g). The longer the fermentation, the lower the remaining sugar and the more tart the flavour. High residual sugar in a kombucha product (above 6g per 100ml) is a signal that fermentation was cut short.

Yes, in small amounts. Since kombucha is brewed from tea, it contains trace caffeine. Fermentation reduces caffeine levels further. A typical serving of 250–350ml contains approximately 10–30mg of caffeine — significantly less than a cup of coffee (around 95mg) or green tea (around 25mg).

Most people can enjoy kombucha without caffeine-related concerns. If you are sensitive to caffeine, consider avoiding it late in the evening.

Trace amounts of alcohol are a natural by-product of the fermentation process. Commercially produced kombucha typically contains less than 0.5% ABV (Alcohol By Volume) — the threshold considered non-alcoholic by food safety standards in most countries. This is comparable to the alcohol levels naturally found in other fermented foods such as soy sauce, kimchi, tempeh, and ripe fruit.

Yes. Kombucha is made entirely from plant-based ingredients — tea, water, sugar, and a SCOBY. It is suitable for vegans, vegetarians, and those following paleo or raw food diets. No animal products are used at any stage of the fermentation process.

Kombucha is generally considered halal. The trace alcohol content (under 0.5% ABV) is a natural by-product of fermentation, not an additive, and is non-intoxicating — similar to fermented foods widely accepted in halal diets such as vinegar, bread, and yoghurt.

However, formal halal certification varies by brand. Please check with your specific brand or the relevant certification body if this is important to you.

Significantly fewer. Pasteurisation kills the live cultures that are central to kombucha’s probiotic properties. A pasteurised product retains some antioxidant polyphenols from the tea base, but loses the live organisms, enzymes, and full organic acid profile of a genuinely fermented drink.

If you are buying kombucha specifically for its probiotic or gut-health properties, a pasteurised product does not deliver them in any meaningful quantity. Any probiotic claim on a pasteurised product is not supported by the production process.

If you are new to kombucha, start with a small amount — around 60–120ml per day — and observe how your body responds over a few hours. Gradually increase to a standard serving of 250–350ml as your body adjusts. Drinking too much too quickly may cause temporary digestive discomfort as the gut adapts.

As a general guideline, up to 500ml (two standard bottles) per day is considered reasonable for most healthy adults. Kombucha is best enjoyed during or after meals to support digestion.

Kombucha is suitable for most healthy adults. The following groups should consult a healthcare professional before consuming:

• Pregnant or breastfeeding women — due to trace alcohol, caffeine, and live cultures
• Children under 5 years of age
• People with weakened immune systems — live cultures may present a risk for immunocompromised individuals
• Individuals on special medical diets or medication — organic acids may interact with certain medications

Focus on two sections: the ingredient list and the nutrition panel. Ignore front-of-pack claims until you have read the back label.

On the ingredient list, look for: brewed or fermented tea as the first or second ingredient, specifically named flavouring ingredients (fresh mango, ginger root, hibiscus flowers), and a SCOBY or kombucha culture. Watch for red flags: carbonated water, natural flavouring without a named source, preservatives, and artificial flavouring.

On the nutrition panel, the key figure is sugar per 100ml. Under 4g indicates a well-fermented product.

Authentic kombucha gets its fizz from a second fermentation — live cultures producing CO₂ naturally in a sealed bottle. This process takes 2–4 days, develops flavour complexity, and produces an integrated, fine carbonation.

Adding carbonated water bypasses second fermentation entirely, producing a drink with artificially sourced fizz that was never genuinely fermented beyond the first stage. The result is a different product — faster and cheaper to produce, but lacking the flavour integration and probiotic activity of genuine second-fermented kombucha.

This criterion scores zero on the KombuchaSG scorecard without exception.

In Singapore, natural flavouring is a legal catch-all declaration. It does not require the brand to disclose what the flavour source actually is, where it came from, or how it was processed. A manufactured mango extract and an extract derived from real mango can both legally be declared as natural flavouring.

A brand using real passion fruit, genuine ginger root, or actual hibiscus has every reason to name these specifically — they are selling points. If flavouring ingredients are not specifically named, the most likely explanation is that they are manufactured extracts rather than whole, real ingredients.

Not necessarily. In Singapore, the word natural on food and beverage labels is currently unregulated. Any brand may use it on the front of a bottle without meeting a defined standard or undergoing any certification process.

A product can legally be labelled natural while containing manufactured flavour compounds, added carbonation, caramel colouring, and preservatives. The front-of-pack claim tells you nothing about what is actually in the bottle. The ingredient list does.

There is no guaranteed way to verify live culture claims from the label alone in Singapore — the claim is unregulated. However, several indicators increase credibility:

• The product is confirmed unpasteurised
• No preservatives appear in the ingredient list
• The product requires refrigeration and has a limited shelf life
• Visible SCOBY strands or sediment are present in the bottle
• The brand discloses CFU count data from independent lab testing

A live cultures or probiotic claim on a pasteurised product, or on a product containing preservatives, is not credible and should not be taken at face value.

Well-fermented, authentic kombucha typically contains 2–4g of sugar per 100ml. This is the benchmark used in the KombuchaSG authenticity scorecard.

Above 4g per 100ml suggests fermentation may have been shortened. Above 6g suggests a significantly shortened fermentation, post-fermentation sweetening, or a production process that prioritises palatability over fermentation completeness. Check the nutrition panel on the back of the bottle — not the front-of-pack.

The KombuchaSG authenticity scorecard is a 7-criteria, 100-point framework used to assess every kombucha brand reviewed on this site. The criteria cover SCOBY origin and integrity, carbonation source, flavouring method, live cultures at point of sale, sugar content after fermentation, ingredient transparency, and production integrity.

The scorecard is published in full before any brand review goes live, so every score is grounded in criteria you can evaluate independently. Every brand — without exception — is assessed using the identical format.

Not necessarily. Price reflects many factors — packaging, branding, distribution, and margin — that are unrelated to fermentation authenticity. Some genuinely fermented, small-batch kombucha is competitively priced. Some expensive products take significant shortcuts in production.

Price is not a reliable proxy for authenticity. The ingredient list and nutrition panel are the only objective sources of information about what is in the bottle.

The five most common shortcuts found in commercial kombucha products in Singapore are:

• Adding carbonated water instead of natural second fermentation
• Using natural flavouring instead of real, named fruit and botanical ingredients
• Pasteurising the product to extend shelf life, killing live cultures in the process
• Shortening fermentation to retain sweetness, resulting in high residual sugar
• Using vinegar or acidulants instead of genuine SCOBY-driven fermentation

No — not in any meaningful way specific to kombucha. The word kombucha is unregulated and may be used by any brand regardless of how the product was made. Terms such as natural, probiotic, live cultures, and raw are also unregulated in the context of beverage labelling in Singapore.

This does not mean all Singapore kombucha brands are misleading — many are genuinely excellent. It means that the label alone cannot be trusted at face value, and that an informed reading of the ingredient list and nutrition panel is the only reliable way to evaluate any product.

Genuinely fermented kombucha is available through specialty health stores, organic grocers, farmers markets, and directly from small-batch producers. Some supermarkets also stock craft kombucha brands.

The key is not where you buy it but what you buy. A product available at a premium health store can still take significant shortcuts. A product sold at a weekend market may be among the most authentically fermented available. Read the label regardless of where you are buying.

Genuine small-batch fermentation takes time, skill, and quality ingredients. A kombucha brewed with a well-maintained SCOBY, real whole fruits, and a 10–16 day production cycle costs more to produce than one made with manufactured flavour compounds, carbonated water, and a shortened process. This cost difference is often reflected in the price.

However, price is not a guarantee of authenticity. Branding, packaging, and distribution costs can also drive a high retail price regardless of what is in the bottle. Always read the ingredient list.

Yes. The Submit Your Brand page is open to all Singapore kombucha brands. Every brand submitted is assessed using the identical 7-criteria scorecard as all other reviewed brands — no exceptions. The same criteria, the same format, the same standards.

Brands are reviewed based on available information — label photography, website disclosures, and direct brand communication where needed.

KombuchaSG does not recommend brands in the traditional sense. We score every brand using a transparent, published scorecard and let the scores speak for themselves. A brand that scores 90 out of 100 earns an Authentic badge because it meets the criteria — not because we are promoting it.

The site does not accept advertising, sponsored reviews, or payment from any brand. Editorial independence is the foundation of every score on this site.

Kombucha can be enjoyed any time of day. Many people prefer it during or after meals to support digestion. Starting with a small amount first thing in the morning on an empty stomach is a popular way to observe its effects on the body directly.

If you are sensitive to caffeine, avoid drinking it late at night — a standard serving contains approximately 10–30mg of caffeine from the tea base.

Kombucha is best served well-chilled, straight from the refrigerator. Drink it directly from the bottle or over ice. It works well as a base for mocktails and can be mixed with fresh citrus, mint, or sparkling water if you prefer a lighter drink.

Do not shake the bottle before opening — kombucha is naturally carbonated and shaking may cause it to overflow. Gently swirl instead if you want to redistribute any settled cultures.

Children under 5 should not consume kombucha. For older children, consult a healthcare provider first — the trace caffeine, trace alcohol, and live cultures may not be appropriate depending on the child’s age, health, and diet.

If you do give kombucha to older children, start with a very small amount and observe the response. Choose a well-fermented product with low residual sugar and confirmed unpasteurised status.

No. Pets have different digestive systems, and even the low levels of caffeine, organic acids, and trace alcohol in kombucha may cause discomfort or harm. Please do not share your kombucha with cats, dogs, or other animals.

Temporary digestive discomfort when first starting kombucha is not uncommon. The live cultures and organic acids are introducing new microbial activity to the gut, which can cause a brief adjustment period — sometimes described as a cleansing reaction.

If this happens, reduce your intake significantly — to 30–60ml per day — and increase very gradually. If discomfort persists or is severe, stop consuming kombucha and consult a healthcare provider. People with sensitive digestive systems or specific gut conditions should take particular care.

Yes — kombucha works well in cooking and in drink mixing. Its acidity makes it a useful substitute for vinegar in salad dressings and marinades. It can be used as a base for mocktails and cocktails, or mixed with fresh juice and herbs.

Note that heating kombucha to cooking temperatures will kill the live cultures — if the probiotic benefit is the reason you are using it, add it at the end of preparation or use it in unheated applications.

Kombucha must be kept refrigerated at all times. The recommended temperature is between 4–7°C. Refrigeration keeps the live cultures dormant, preserves carbonation, maintains flavour, and prevents over-fermentation.

Always store bottles upright and only open them at the point of consumption. If you have received a delivery of kombucha that has been out of refrigeration during transit, chill it as soon as possible and consume it within a few days.

Unopened kombucha can last 2–3 months when stored correctly in the refrigerator. Over time, the flavour will continue to develop — becoming more tart and vinegary — as live cultures continue to slowly ferment the residual sugars. It does not spoil in the same way as conventional beverages, but the taste will change.

For the best flavour and probiotic benefit, consume within the timeframe recommended on the label. Once opened, consume within a few days. The kombucha will not spoil but will gradually lose its fizz.

Only briefly. A warm, sealed bottle allows ongoing fermentation that builds CO₂ pressure, which can cause caps to loosen and bottles to overflow when opened. It is fine to leave kombucha out for up to a few hours — such as at a meal table — but it should be refrigerated as soon as possible.

Leaving kombucha at room temperature for extended periods will also cause it to over-ferment, producing a strongly vinegary taste and significantly reducing the residual sweetness.

Natural carbonation in kombucha is more variable than industrial carbonation. Several factors can reduce fizziness: the bottle was stored at too warm a temperature, it has been open for more than a day, or the natural carbonation of this particular batch was lighter than usual.

Reduced fizziness in an unopened, properly refrigerated bottle is normal batch variation in an authentic product — not a defect. A kombucha that is always perfectly and uniformly carbonated has typically had its carbonation engineered rather than naturally produced.

Freezing will kill the live cultures and alter the flavour and carbonation of the kombucha. It is not recommended. If a bottle has been accidentally frozen and then thawed, the live culture activity will be significantly reduced — the drink is still safe to consume but will no longer have the probiotic properties of a genuinely live product.