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Research
Microbial profile
Meal response trial
Responsible claims
Good Brew research in plain English
The useful point is not that one study answers every question. The useful point is that Good Brew has been willing to put its product into research settings and explain the results with boundaries.
| Study area | What it tested | What it can support | What it cannot prove |
|---|---|---|---|
| Microbial and physicochemical analysis | The Good Brew original base kombucha, using metagenomics amplicon sequencing and lab analysis. | The tested base kombucha had a broad microbial profile and measurable biochemical characteristics. | It does not prove that microbial diversity alone causes a clinical result. |
| Meal response trial | A high GI rice meal consumed with soda water, diet lemonade, or Good Brew kombucha. | In that study, the kombucha meal was associated with lower post meal glucose and insulin responses than soda water. | It does not prove diabetes treatment, long term results, or the same result for all kombucha. |
What the microbial testing found
The paper identified 34 genera and 200 microbial species in the tested Good Brew base kombucha. A microbial profile is a way of describing the bacteria and yeasts identified in a sample. In kombucha, that profile can be affected by the tea, sugar, starter culture, fermentation time, temperature, bottling, and storage.
The result is useful because kombucha is a live ferment, and live ferments are not all the same. A pasteurised drink, a force carbonated drink, and a properly fermented live kombucha may be very different products, even when they sit in the same drinks category.
Read it carefully
What it shows: the tested Good Brew original base kombucha had a broad microbial profile.
What it does not show: that every bottle, every flavour, or every kombucha brand has the same profile.
What it cannot prove: that microbial diversity alone produces a clinical result.
What this means
- The trial gives Good Brew a source backed way to discuss kombucha, blood glucose, and insulin response.
- The result relates to one acute meal test in healthy adults.
- The tested kombucha was Good Brew kombucha, not a generic kombucha category.
What the blood sugar trial can and cannot show
The blood sugar and insulin response study was published in Frontiers in Nutrition in 2023. It used a randomised, single blinded, placebo controlled crossover design and involved 11 healthy adults.
The study tested a standard high GI rice based meal consumed with one of three drinks: soda water, diet lemonade soft drink, or organic kombucha from The Good Brew Company. The kombucha meal was associated with lower post meal glucose and insulin responses than the same meal consumed with soda water.
That finding is narrow but meaningful. Under the conditions tested, this specific unpasteurised kombucha changed the acute post meal response compared with the control drink. The responsible reading is to keep the result tied to the study design.
Why research matters for a live food brand
Live fermented products are variable by nature. Ingredients, culture, fermentation conditions, bottling, storage, and handling can affect what ends up in the glass. That is why research matters for Good Brew. The Brunswick brewery is not relying only on generic kombucha language.
Name the product tested
A study on Good Brew kombucha should not be rewritten as a claim about all kombucha.
Name the study limits
Sample size, study type, product tested, and test conditions are part of the result.
Avoid medical promises
How to read kombucha health claims responsibly
Good Brew can talk about kombucha science without promising outcomes. That restraint makes the evidence more useful, not less.
Before trusting a claim, check:
- Who conducted or published the study?
- What product was tested?
- Was it a clinical trial, lab analysis, animal study, or product profile?
- How many people or samples were involved?
- Was the result short term or long term?
- Does the claim go further than the evidence?
Research sources
Microbial diversity and characteristics
Year: 2021
Publication: Nutrients
Study type: Microbial and physicochemical analysis
This paper profiled Good Brew’s original base kombucha and identified a broad microbial profile. It is product evidence, not a clinical outcome study.
Glycemic index and insulin index
Year: 2023
Publication: Frontiers in Nutrition
Study type: Randomised crossover trial
This paper tested a high GI meal consumed with Good Brew kombucha, soda water, or diet lemonade soft drink in 11 healthy adults.
Kombucha research media release
Year: 2023
Publication type: Good Brew media release
This is useful background on how the research was announced, but peer reviewed papers should remain the main source for scientific claims.
Frequently asked questions
Does Good Brew kombucha lower blood sugar?
One small randomised crossover trial found that a high GI rice meal consumed with Good Brew kombucha was associated with lower post meal glucose and insulin responses than the same meal consumed with soda water. The study involved 11 healthy adults and tested an acute meal response. It should not be read as evidence that kombucha treats diabetes or gives the same result in every setting.
What does 200 microbial species mean?
The microbial analysis identified 200 microbial species in the tested Good Brew original base kombucha. That finding describes the complexity of the ferment. It does not, by itself, prove a clinical outcome.
Is all kombucha the same?
No. Ingredients, culture, fermentation time, pasteurisation, storage, and handling can all affect kombucha. The Good Brew studies should be read as evidence about the tested Good Brew product, not as proof that every kombucha behaves the same way.
Is kombucha medical advice?
No. Kombucha is a food and drink product. Anyone with a medical condition, pregnancy, immune compromise, or a personal health concern should speak with a qualified health professional.
Frequently asked questions
A good kombucha claim should be tied to a source, a product, a date, and a limitation. Broad claims about gut health, inflammation, immunity, blood sugar, or disease need extra care because they can quickly move beyond what a study proves.
Good Brew can talk about kombucha science without promising outcomes. That restraint makes the evidence more useful, not less.