What Is Akkermansia and Do You Need a Supplement?

Akkermansia muciniphila is one of the few gut bacteria that has been tested as a supplement in a randomized human trial. The results were encouraging but small. Almost everything else known about it comes from observation and animal studies. That gap between headlines and evidence is the key to deciding whether a supplement makes sense for you.

What is Akkermansia muciniphila?

Akkermansia muciniphila is a bacterium that lives in the mucus layer covering the gut lining and feeds on mucin, the main protein in that mucus. It was first described and named in 2004 as a mucin-degrading bacterium from the human intestine.

The gut microbiota is the community of microorganisms living in your digestive tract. Akkermansia is a common member of it: a 2008 study found that it accounted for more than 1 percent of all bacterial cells in stool samples. It colonizes the gut in infancy and reaches adult levels of roughly 100 million cells per gram within about a year. A 2007 study found that its levels decrease in elderly people.

What does Akkermansia do in the gut?

Akkermansia feeds on mucin and is thought to influence the gut barrier, the mucus-coated lining that separates what is inside your intestine from the rest of your body. Most of the mechanism work so far comes from mice.

In a 2013 mouse study, Akkermansia levels were lower in obese and type 2 diabetic mice. Giving the bacterium to mice on a high-fat diet improved fat gain, insulin resistance and markers of gut barrier function. The same study found that feeding the mice prebiotics, which are fibers that gut bacteria ferment, brought Akkermansia levels back toward normal.

In people, the evidence is mostly observational. A 2016 study of 49 overweight and obese adults found that those with more Akkermansia at the start had lower fasting glucose and a healthier fat distribution. They also showed larger improvements in insulin sensitivity markers after a 6-week calorie-restricted diet. A link like this does not show that the bacterium caused the difference.

A 2022 review by researchers who have studied Akkermansia for years describes the field as moving from simple associations toward causal evidence, based on animal models and one human proof-of-concept trial.

Is Akkermansia linked to GLP-1?

Possibly, but so far the link has been shown in cells and mice, not in people. GLP-1 (glucagon-like peptide-1) is a hormone that specialized gut cells release after a meal. It takes part in fullness signaling and blood sugar regulation.

A 2021 study identified a protein secreted by Akkermansia, named P9, that triggered GLP-1 release from cultured gut cells and in mice on a high-fat diet. The human trial described below reported changes in insulin sensitivity and cholesterol. Its abstract does not report GLP-1 levels. No supplement contains GLP-1 and a bacterium in a capsule is not a substitute for a GLP-1 medication.

What did the human trial on Akkermansia find?

The only randomized, placebo-controlled human trial so far was a pilot study in which the pasteurized form improved insulin sensitivity and lowered cholesterol compared with placebo. It was published in 2019 and enrolled 40 overweight or obese adults with insulin resistance. Thirty-two completed it.

Participants took about 10 billion Akkermansia bacteria daily for three months, either live or pasteurized, or took a placebo. Compared with placebo, the pasteurized group showed:

• Insulin sensitivity that was about 29 percent higher
• Blood insulin levels that were about 34 percent lower
• Total cholesterol that was about 9 percent lower
• Body weight that was about 2.3 kg lower, a difference that did not reach statistical significance

Both the live and the pasteurized form were safe and well tolerated. The study was small and ran at a single center. It enrolled a specific group, so the results cannot be applied to everyone. Several of its authors are inventors on Akkermansia patents and co-founders of a company developing the bacterium, which is worth knowing when you weigh the findings.

Is live or pasteurized Akkermansia better?

Nobody can say for certain, but the pasteurized form has the stronger evidence so far. In the human trial the improvements reported against placebo were for the pasteurized form. A 2017 mouse study also found that pasteurization enhanced the bacterium's effects.

The picture is not simple. A 2013 mouse study found that heat-killed cells gave no benefit, which suggests that the way the bacteria are heated matters and that results from one preparation do not automatically carry over to another. The 2017 paper also noted that Akkermansia is sensitive to oxygen, a handling challenge for live products. It identified a heat-stable protein on the outer membrane of the bacterium that reproduced part of the effects in mice.

A practical consequence concerns units. Pasteurized cells cannot multiply, so the usual CFU (colony-forming units) count does not apply to them. Pasteurized products use AFU (active fluorescent units), a count of intact cells.

How much Akkermansia per day has been studied?

The only controlled human trial used about 10 billion bacteria per day for three months. It tested a single dose, so no one can say what the minimum or the best amount is.

That makes the label the most useful tool you have. Many products only state "contains Akkermansia" or hide the amount inside the total of a blend, which tells you nothing about what you take each day. Comparisons between products also need care, because a CFU figure and an AFU figure do not measure the same thing.

Can food raise Akkermansia instead of a supplement?

Food can shape the gut community that Akkermansia lives in, but no common food is a reliable source of the bacterium itself. Yogurt and fermented vegetables are known for other species.

The indirect route is prebiotic fiber, which gut bacteria ferment. The 2013 mouse data showed that prebiotic feeding brought Akkermansia back toward normal levels.

Foods rich in fermentable fiber include chicory root, onions, garlic, leeks, oats, beans and lentils. How strongly these foods change Akkermansia in people is less clear than in mice. Results also differ from person to person.

Does Akkermansia have side effects?

In the 2019 trial, three months of daily Akkermansia was safe and well tolerated. A 2017 paper reported the same for administration to humans. The data come from small, short studies in a specific group, so long-term safety in the general population has not been established.

Supplements often combine Akkermansia with other ingredients. Berberine, a plant compound found in some of these formulas, has been studied alongside diabetes medication. A 2012 review of 14 small randomized trials found that berberine added to glucose-lowering medication gave better blood sugar control than the medication alone. That is why doctors want to know about it if you take such drugs.

Do you need an Akkermansia supplement?

No. Akkermansia is not an essential nutrient like a vitamin, so there is no recommended daily intake and no defined deficiency. A supplement is an optional extra for adults who want to try a form and an amount that research has looked at.

Three points are worth checking before you buy one. First, whether your diet already contains fermentable fiber every day, because a supplement does not replace it. Second, whether you accept that the human evidence rests on one small pilot trial. Third, whether you can keep a daily routine for about three months, the length of that trial.

Akkermansia supplements are not weight-loss products. Any change from a gut-focused supplement is gradual and individual. Diet, activity and sleep remain the main drivers of metabolic health.

When should you see a doctor?

Talk to a doctor before starting an Akkermansia supplement if you take blood sugar medication, are pregnant or nursing, or have a diagnosed digestive or immune condition. Some symptoms also need a medical evaluation instead of a supplement.

Ask your doctor first if any of these apply to you:

• You take insulin or another medication that lowers blood sugar, especially if the formula also contains berberine
• You are pregnant, trying to conceive or nursing
• You have inflammatory bowel disease or another diagnosed digestive condition
• You have a weakened immune system or take immunosuppressive medication

Seek medical advice promptly if you notice any of these warning signs:

• Unexplained weight loss
• Blood in your stool or black, tarry stools
• Abdominal pain that lasts more than a few days
• Diarrhea or constipation that lasts more than three weeks
• Extreme thirst, frequent urination or unusual fatigue, which can signal high blood sugar

Bring the supplement label to the appointment so your doctor can check each ingredient against your medication.

How naturaveda approaches Akkermansia

naturaveda GLProbio-1 is a daily gut and metabolic formula developed in Germany. It is built around pasteurized Akkermansia muciniphila and formulated to support a healthy gut lining and balanced gut flora.

One daily serving of 2 capsules contains:

• Akkermansia muciniphila (pasteurized), 30 billion AFU
• Bacillus coagulans, 7 billion AFU
• Chicory inulin, 300 mg
• Berberine HCl from Berberis aristata root extract, 400 mg
• Chromium as picolinate, 200 mcg
• Vitamin D3 from lichen, 20 mcg (800 IU)
• Riboflavin (vitamin B2), 1.2 mg

The capsules are vegan, gluten-free and lactose-free. One bottle holds 60 capsules, enough for 30 days.

GLProbio-1 is a dietary supplement. It does not contain GLP-1, it is not a medication and it does not replace medical care or a fiber-rich diet. People who take blood sugar medication should speak to their doctor before using any product that contains berberine.