akkermansia-guide

Vitality Supplements · Microbiome Guide

What is Akkermansia?

A next-generation gut bacterium explained from the ground up — what it is, where it lives in the gut lining, what AFU means, why a named strain and a stated count matter, and the role of the prebiotic fibre inulin.

Last updated June 2026 · Written by Vitality Supplements Editorial Team · ~2,100 words · 9 min read
Food supplement information — not medical advice
UK manufactured ISO/IEC 17025 batch tested 4.8★ from 2,400+ reviews Evidence-referenced
Quick answer
What is Akkermansia?
Akkermansia muciniphila is a naturally occurring gut bacterium that lives in the protective mucus layer of the human intestine, where it metabolises mucin. First described in 2004 and named after the microbiologist Antoon Akkermans, it is one of the more abundant single species in a healthy adult microbiome. Because it is hard to grow in a lab, supplement counts are usually given in AFU (Active Fluorescent Units) rather than CFU. It is a next-generation microbe, often paired with the prebiotic fibre inulin. Akkermansia is a food supplement in the UK with no authorised health claims.
Key takeaways
  • Akkermansia muciniphila is a naturally occurring human gut bacterium, first described in 2004.
  • It lives in the intestinal mucus layer and uses mucin as a food source.
  • It is a "next-generation" microbe — newer to supplements than lactobacillus or bifidobacterium.
  • Counts are given in AFU, not CFU, because it is difficult to culture — the two units aren't comparable.
  • The named strain, the stated count and the form (live or pasteurised) matter more than marketing language.
  • It is a UK food supplement with no authorised health claims.
The basics

What Akkermansia actually is

Akkermansia is not a vitamin or a herb — it is a living (or, when pasteurised, intact) microorganism. Its full name is Akkermansia muciniphila: a Gram-negative, oxygen-avoiding bacterium first isolated and formally described in 2004. The name honours the Dutch microbiologist Antoon Akkermans, and muciniphila means "mucin-loving" — a direct clue to where it lives and what it does.

It is a normal resident of the human digestive tract. Estimates vary by population and method, but in many healthy adults it accounts for somewhere in the region of one to four per cent of all the bacteria in the gut — which makes it one of the more abundant individual species most people carry. In isolated supplement form it is classed as a next-generation microbe, and a transparent label names its species precisely rather than hiding behind a category word — a point we return to in Strain, AFU & honesty.

A precise organism with a precise name: Akkermansia muciniphila, the mucin-lover.
The biology & the research

A next-gen microbe in the mucus layer

Because Akkermansia lives in and feeds on the gut's mucus layer, it sits in a different category from the traditional probiotics most people know. That is a statement about its biology and classification, not about any effect.

Akkermansia is one of the organisms researchers have examined in the context of gut-barrier and metabolic biology. To be clear about what that means: it indicates that scientific investigation exists, not that any benefit has been established or authorised — and a good deal of that work is preclinical or early. Separately, pasteurised Akkermansia muciniphila is authorised as a novel food in Great Britain and the EU; that is a safety and market-authorisation status, and it is not a health claim. We reference what is studied and what is authorised; we don't extrapolate to outcomes, because Akkermansia carries no authorised UK health claims.

A next-gen microbe
What it is. A naturally occurring gut bacterium — newer to supplements than lactobacillus or bifidobacterium strains.
Lives in mucus
Where it sits. In the intestinal mucus layer, where it uses mucin — the main protein in mucus — as a food source.
Measured in AFU
How it's counted. By Active Fluorescent Units via flow cytometry, because it is difficult to culture and CFU would undercount it.
A research association
What's studied. Examined in gut-barrier and metabolic research. Research describes associations, not authorised outcomes.
Where it lives

The mucus layer & the gut

The inside of your intestine is coated in a layer of mucus that sits between the gut contents and the cells of the gut wall. Akkermansia is one of the species adapted to live in that layer, where it degrades mucin — the main protein in mucus — and uses it as a food source. Unlike trigonelline in coffee or fenugreek, you don't get Akkermansia from your diet: it is a resident of the gut itself.

This is the part researchers find interesting, and also the part most easily over-sold. Because Akkermansia interacts with the mucus layer, it has been studied in relation to gut-barrier biology — studied being the operative word. The honest reading of its abundance is simple: it is a normal, often-notable part of a healthy adult microbiome.

It isn't something you eat — it's a resident of the gut mucus layer itself.
2004
First describedIsolated and named after Antoon Akkermans.
1–4%
Of gut microbiotaA typical share in many healthy adults.
Mucin
Its food sourceThe main protein in the gut mucus layer.
30B
AFU per servingWith 390 mg inulin, in a Vitality serving.
  • The mucus layer — Akkermansia lives between the gut contents and the gut wall, not in the open cavity.
  • Mucin-degrading — it uses mucin, the main mucus protein, as a food source.
  • Not dietary — it's a gut resident, not something obtained from food like many nutrients.
  • A normal resident — typically a notable share of a healthy adult microbiome.
This is the important bit

Why AFU, strain & form matter

If you've only ever seen CFU on a probiotic label, Akkermansia's count works differently. Conventional probiotics are counted in CFU (Colony-Forming Units) — cells spread on a plate that grow into colonies. Akkermansia is notoriously hard to culture, so counting it that way would dramatically under-count what's in the capsule. Instead it's measured in AFU (Active Fluorescent Units), which counts intact cells directly by fluorescence. So 30 Billion AFU is not "more" or "less" than 30 Billion CFU — it's a different measurement. Read the unit, not just the number.

Two more things separate an honest label from a vague one. Strain: findings in microbiome research are strain-specific, so the species and strain should be named, not buried in a "blend". Form: Akkermansia comes live or pasteurised, and a clear label says which — pasteurised is the form with novel-food authorisation. We unpack all of this, and how to compare products fairly, in the next guide.

Same word on the label — but the unit, strain and form are what actually differ.
Common questions

Akkermansia FAQ

It's a gut bacterium taken as a supplement, so it sits in the broad probiotic family — but it's usually described as a next-generation microbe, newer and more specialised than traditional lactobacillus or bifidobacterium strains, and measured in AFU rather than CFU.
Active Fluorescent Units. It's a way of counting bacterial cells directly using fluorescence-based flow cytometry, used for microbes like Akkermansia that are difficult to grow in a lab and would be undercounted by the colony-counting CFU method.
Pasteurisation makes the cells non-viable, so they won't multiply — but the intact cells are still present and still counted by AFU. Pasteurised Akkermansia muciniphila is also the form authorised as a novel food in Great Britain and the EU.
Each serving provides 30 Billion AFU of Akkermansia muciniphila together with 390 mg of inulin, in a 60-capsule pouch. The count and unit are stated on the label.
Inulin is a prebiotic fibre — a fermentable fructan, typically from chicory. "Prebiotic" describes the fibre itself; it isn't a health claim. It's included as a stated 390 mg per serving.
No health claims are currently authorised for Akkermansia or inulin under UK/EU rules, so we don't make any. This guide explains what the organism is and what research has investigated. Strain, AFU & honesty covers the regulatory position in full.

Strain, AFU & honesty

Now you know what Akkermansia is — the next guide is about reading a label straight: the regulatory position, AFU vs CFU, pasteurised vs live, and how to compare microbiome supplements fairly.

Read: Strain, AFU & honesty → View Akkermansia 30 Billion AFU
Continue reading

About the author. This guide was written and reviewed by the Vitality Supplements Editorial Team, a UK supplement manufacturer. Every batch we produce is independently tested by an ISO/IEC 17025-accredited laboratory, with a Certificate of Analysis available on request.

This article is for general information about food supplements and is not medical advice. Akkermansia muciniphila and inulin are sold as food supplements in the UK and carry no authorised health claims. Always consult a qualified healthcare professional before starting any supplement, particularly if you are pregnant, breastfeeding, taking medication or managing a health condition. References available on our research references page.