Podcast episode 128 (in German)
Akkermansia – the gut bacterium that works better when killed, and the question: for whom?
November 5, 2026
A gut bacterium as a capsule, marketed as a longevity probiotic, and in the first human study it was precisely the killed form that worked most clearly. There are now more studies, one of them with its weight goal reached, and a question that stands above them all: for whom?
What it is about
Akkermansia muciniphila was described in 2004 at Wageningen University, a bacterium that lives on the mucus of the gut wall and in mice even made this protective layer thicker. People with overweight, type 2 diabetes or high blood pressure have less of it on average, with exceptions. The episode resolves an apparent contradiction: in 2013 only live bacteria worked in mice, later in humans the killed ones, but in 2013 they were killed in an autoclave and in 2016 gently pasteurized. After that, it goes through the studies in humans, almost all closely linked to manufacturers, and through what participants wrote down about their stomachs. At the end stands a lead: it was above all people with little Akkermansia of their own who benefited.
Key points
- Pasteurized, half an hour at 70 degrees, Akkermansia unexpectedly worked more strongly in mice in 2016 than when alive; a protein on the outer membrane survives the temperature and partly works on its own.
- In 2019, 32 of 40 insulin-resistant people with overweight completed a 3-month study; with the pasteurized form, insulin sensitivity rose by around 29 percent compared with placebo, and body weight was a good 2 kilos lower, not statistically confirmed.
- In China, a 2025 study of 58 people with type 2 diabetes found no overall difference from placebo after 12 weeks; only those who had little Akkermansia at the start benefited.
- A study from Ireland and Kiel with 142 people with metabolic syndrome missed its primary goal after 4 months; with little Akkermansia, insulin sensitivity rose by 26 percent after 3 months, in an exploratory analysis.
- In Maastricht, 90 people first lost weight for 8 weeks and then received pasteurized Akkermansia or placebo for half a year: they regained 1.2 instead of 3.2 kilos, and the primary goal was reached.
- In Kiel, 36 percent on Akkermansia had mild to moderate gastrointestinal complaints, 24 percent on placebo; in the first study, cramps occurred in 4 of 13 on placebo and 2 of 13 on the pasteurized form.
Where the data stop
In humans there are several small studies lasting months, measured by insulin values and weight, not by diseases or a longer life. One reached its primary goal, two missed it, and almost all are tied to manufacturers; the one from Maastricht was paid for by the company that sells the product. An American mixed product with 5 strains and fiber landed exactly on the threshold in 76 people with diabetes, 0.050, and what Akkermansia does in it on its own cannot be read off. The lead that above all people with little Akkermansia of their own benefit appears three times, but is partly exploratory, and whether you have little is not stated on any tin. It does, however, explain why two people taking the same capsule can experience different things.
In the EU, only the pasteurized form has been authorized as a novel food since February 2022, assessed for adults excluding pregnant and breastfeeding women. There are no counted experience reports; what people feel is their stomach, what is measured is insulin sensitivity. Anyone with a weakened immune system or a serious bowel disease should clarify this with a doctor beforehand.
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Published on November 5, 2026.
The topic in the database
- Gut bacterium that lives on the mucus layer of the gut wall. Lean, metabolically healthy people usually have a lot of it, people with overweight little.Akkermansia muciniphila
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Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in the hands of a physician. Last updated: 2026-10-09.