Akkermansia Muciniphila

What is Akkermansia muciniphila?

Akkermansia muciniphila is a bacterium that lives in the mucus layer lining the human gut, where it feeds on mucin, the protein that makes up that layer. It has drawn attention because people with obesity, type 2 diabetes or other metabolic problems tend to have less of it in their stool. That observation led researchers to ask whether adding it back might help, which puts it in a group sometimes called “next-generation probiotics.”

Unlike classic probiotics such as lactobacilli and bifidobacteria, which have been eaten in fermented foods for centuries, Akkermansia is not a traditional food microbe. It is strictly anaerobic and hard to produce, and some products use a pasteurized (heat-killed) form.

What the research says

Metabolic health

The first human trial was a small randomized, double-blind, placebo-controlled study in 40 adults with overweight or obesity and insulin resistance, 32 of whom finished (Depommier et al., 2019). Participants took about 10 billion bacteria a day, live or pasteurized, for three months. Both forms were safe and well tolerated. Compared with placebo, the pasteurized form improved insulin sensitivity by about 29% and lowered insulin and total cholesterol. Changes in body weight and fat mass were small (about 2 kg) and did not reach statistical significance. Several authors hold patents on Akkermansia and co-founded a company that sells it, which is worth keeping in mind.

A 12-week trial in 58 people with type 2 diabetes and overweight found no significant difference from placebo in body weight or HbA1c overall; benefits appeared mainly in participants who started with low levels of Akkermansia (Zhang et al., 2025). Overall, the human evidence is early and comes from small studies of specific strains and doses.

Digestion and regularity

We did not find good human evidence that Akkermansia improves constipation, bloating or bowel regularity. Claims linking it to “GLP-1” or appetite come mostly from animal research on how it affects gut hormones.

How it’s used in supplements

Akkermansia is now sold alone and in blends. Research used around 10 billion cells a day. Many blends list it only by weight in milligrams, without a colony-forming unit count, so it is impossible to tell whether the amount resembles what was studied. Live Akkermansia is sensitive to oxygen, which raises questions about how many cells survive in a powder stored at room temperature unless the product states otherwise.

In the trial above, side effects were similar to placebo. Like other probiotics, it may cause temporary gas or bloating. People with weakened immune systems, serious illness or a central line should talk with a doctor before taking any probiotic, since rare serious infections from probiotics have been reported in vulnerable patients (NCCIH: Probiotics). Its long-term safety in the general population is not yet well characterized.