Comparison of two Akkermansia proteins: P9 is secreted and binds ICAM-2 on L-cells to release GLP-1, measured mostly in mice; Amuc_1100 sits on the outer membrane, binds TLR-2 and supports barrier integrity, with an inconsistent GLP-1 effect.

Akkermansia and GLP-1: What the Connection Actually Is

Akkermansia muciniphila is sold almost everywhere as a GLP-1 supplement, and the claim is usually made with a wave of the hand: it supports your natural GLP-1. That is vague enough to be unfalsifiable, which is generally a warning sign.

The unusual thing here is that the underlying mechanism is not vague at all. Researchers have identified the specific protein, the specific receptor it binds to, and the specific cell that responds. It is one of the better-characterised bacteria-to-hormone pathways we have.

It is also, almost entirely, measured in mice. Both of those things are true at once, and any article that gives you only one of them is selling you something.

First, what GLP-1 is doing here

GLP-1 is a hormone your gut releases when food arrives. It slows stomach emptying, signals fullness, and helps regulate the glucose response to a meal. It is made by L-cells, which sit in the lining of your intestine — and it is broken down within about two minutes by an enzyme called DPP-4. That short life is by design: a meal signal that never switched off would be useless. We covered how to increase GLP-1 naturally separately.

So the question for any bacterium is narrow and answerable: does it make L-cells release more GLP-1, and by what route?

The protein with a name: P9

In 2021, researchers isolated a protein secreted by Akkermansia muciniphila and called it P9. It is an 84-kilodalton protein, the product of a gene labelled Amuc_1631, and it does something quite specific: it binds to a receptor called ICAM-2 on the surface of L-cells, and that binding triggers GLP-1 release.

There is a second, indirect route in the same work. P9 also prompts immune and epithelial cells to release interleukin-6, and IL-6 independently encourages L-cells to secrete GLP-1. So the bacterium appears to push the same lever twice, directly and through the immune signal.

That is a real mechanism, described at the level of the molecule. It is considerably more than most supplement ingredients can claim, and it is why this particular bacterium keeps appearing in metabolic research rather than only in marketing copy.

Comparison of two Akkermansia proteins: P9 is secreted and binds ICAM-2 on L-cells to release GLP-1, measured mostly in mice; Amuc_1100 sits on the outer membrane, binds TLR-2 and supports barrier integrity, with an inconsistent GLP-1 effect.
P9 is the GLP-1 route. Amuc_1100 is the barrier route. Labels routinely conflate them.

The protein that gets confused with it: Amuc_1100

You will often see Amuc_1100 cited as the reason Akkermansia raises GLP-1. That is a conflation worth untangling, because the two proteins do different jobs.

Amuc_1100 sits on the bacterium's outer membrane rather than being secreted. It binds TLR-2, a receptor involved in immune signalling, and the good evidence for it concerns the gut barrier — the integrity of the lining itself. That matters, and it fits with what Akkermansia does in the mucus layer.

But its effect on GLP-1 specifically is weaker and less consistent. At least one study looked for Amuc_1100-induced GLP-1 secretion and did not find it. If you see a label implying that Amuc_1100 is the GLP-1 mechanism, that is a step beyond what the evidence currently supports.

Where the evidence runs out

Here is the part that gets left out. The P9 work — the receptor, the binding, the hormone response — is predominantly mouse research. Cell studies support it, and the pathway is coherent. But "we know which receptor it binds in a mouse" is not the same claim as "it will change your blood sugar".

Human data on Akkermansia exists, and it is modest. The most cited trial gave people with metabolic syndrome a pasteurised preparation and measured insulin sensitivity and body composition. It was small, it ran for months rather than years, and its results were encouraging rather than dramatic. There is also early evidence that people who start with low Akkermansia levels may respond differently from those who already have plenty — which would make the population you belong to part of the answer.

The pasteurised puzzle

The most counter-intuitive detail in this literature is that the human trial used bacteria that had been killed by heat — and they performed at least as well as the live strain.

That makes sense if the active parts are structural. A membrane protein like Amuc_1100 does not need the cell to be alive to bind TLR-2. It does raise an obvious question about P9, which is secreted by living bacteria and therefore may not survive the same treatment. The honest position is that the field has not fully settled which components are doing what in humans.

Practically, it means CFU counts on a jar are a poor guide here. What matters is the strain, whether it survives to the colon, and whether anything in the formula feeds it on arrival — which is a different set of questions from the one most labels answer. That is the same argument as why a probiotic needs a prebiotic.

What we would say if you were deciding

Akkermansia has a genuine, named mechanism for influencing GLP-1, and that puts it ahead of most of the category. It does not have human outcome data that would justify calling it a weight-loss solution, and anyone telling you otherwise — including us — is ahead of the evidence.

Nothing here approaches what a GLP-1 medication does. A prescription drug resists the enzyme that clears the hormone, which is why one injection works for a week; no bacterium does that. If that comparison is what you are weighing, read is there an over-the-counter Ozempic? first.

Common questions

Does eating Akkermansia raise GLP-1 in humans?

Not demonstrated directly. The GLP-1 pathway is mouse and cell work; the human trials measured metabolic markers rather than GLP-1 outcomes. Treat the mechanism as promising rather than proven.

Is P9 in supplements?

No. P9 is a protein the bacterium secretes, not an ingredient you can buy. Products contain the organism itself, live or pasteurised.

Can I get Akkermansia from food?

Not directly — it is not in yoghurt or any fermented food. You feed the population you already carry, mainly with polyphenols. See how to increase Akkermansia naturally.

Does it work alongside a GLP-1 medication?

There is no known interaction, but that is a question for the doctor who prescribed it, not for a website.

For transparency: Crave Fade contains Akkermansia muciniphila at 10 mg (100B TFU/g) with 500 mg of inulin alongside it. We include it because the mechanism is real, and we are telling you plainly that the human evidence behind it is still thin.

Read next

This article is for general information and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Talk to a healthcare professional before starting any supplement.

Back to blog