Akkermansia Side Effects: What the Research Says (2026)
Is Akkermansia Safe to Take?
Current clinical evidence suggests that Akkermansia muciniphila is safe and well tolerated for most healthy adults. Published human clinical trials have not reported any serious adverse effects, although mild digestive symptoms such as bloating or changes in bowel habits can occur when first starting supplementation.
The short answer, based on current clinical evidence, is yes — Akkermansia supplementation appears to be safe and well-tolerated in healthy adults. Here’s what the research actually shows.
In the landmark 2019 placebo-controlled clinical trial, researchers reported no serious adverse events among participants receiving Akkermansia supplementation over a 12-week period.
Contents
• Is Akkermansia Safe?
• Clinical Trial Evidence
• Common Side Effects
• Live vs Pasteurised Akkermansia
• Who Should Exercise Caution?
• How to Reduce Side Effects
• Frequently Asked Questions
• References
| Side Effect | How Common? | Duration |
|---|---|---|
| Mild bloating | Uncommon | 1–2 weeks |
| Loose stools | Uncommon | Temporary |
| Mild nausea | Rare | Temporary |
| Serious adverse effects | None reported in clinical trials | — |
What the Clinical Trials Say
The 2019 Nature Medicine Trial
The landmark human trial on Akkermansia supplementation was published in Nature Medicine in 2019 (Plovier et al. / Depommier et al.). This randomised, double-blind, placebo-controlled study gave overweight or obese adults either a placebo, live Akkermansia, or pasteurised (heat-treated) Akkermansia for 12 weeks.
Key safety findings:
- No serious adverse events were reported in any group
- Pasteurised Akkermansia was safe and well-tolerated throughout the 12-week period
- Blood markers, liver enzymes, and kidney function remained within normal ranges
- The pasteurised form outperformed live Akkermansia on metabolic outcomes, and was equally safe
Subsequent Safety Data
Follow-up studies and safety reviews have consistently confirmed this profile. A 2021 safety assessment published in Nature Reviews Gastroenterology & Hepatology concluded that Akkermansia muciniphila has a favourable safety profile in humans, with no clinically significant adverse effects identified across available trials.
Side Effects
In clinical trials, side effects from Akkermansia supplementation have been mild and infrequent. The most commonly noted include:
- Mild digestive changes: Some participants reported temporary changes in bowel habits or mild bloating during the initial weeks of supplementation. This is consistent with any significant shift in gut microbiome composition and typically resolves within 1–2 weeks.
- Loose stools: Reported by a small minority of participants, usually in the early stages of supplementation.
- Mild nausea: Occasionally reported, particularly when taken on an empty stomach.
These effects are generally transient and comparable to those seen with other probiotic supplements. They are thought to reflect the gut microbiome adjusting to the introduction of a new bacterial strain rather than a direct toxic effect.
When Should You Stop Taking Akkermansia?
Although Akkermansia is generally well tolerated, you should stop taking it and seek medical advice if you experience persistent digestive symptoms, signs of an allergic reaction, or any unexpected side effects. While serious adverse events have not been reported in published human clinical trials, it's sensible to discontinue any supplement that doesn't agree with you and discuss alternatives with your healthcare professional.
Who Can Benefit From Akkermansia?
Akkermansia supplements are primarily intended for healthy adults interested in supporting their gut microbiome. Research has focused on individuals with overweight, obesity, and metabolic dysfunction, although more studies are needed before conclusions can be extended to the wider population. It should not be viewed as a treatment for any medical condition.
Does Akkermansia Interact With Medications?
There are currently no well-documented drug interactions involving Akkermansia muciniphila in published human clinical studies. However, because research is still developing, anyone taking prescription medication—particularly immunosuppressants or biologic therapies—should consult a healthcare professional before starting supplementation.
Live vs Pasteurised Akkermansia: Does It Matter for Safety?
One important distinction in the research is between live and pasteurised Akkermansia. The 2019 Nature Medicine trial found that pasteurised Akkermansia was not only safer in terms of tolerability, but also more effective — producing greater improvements in insulin sensitivity, cholesterol, and liver inflammation than the live form.
The reason: heat treatment exposes a key surface protein called Amuc_1100, which is responsible for many of Akkermansia’s beneficial effects on the gut barrier and immune system. Pasteurisation makes this protein more bioavailable while also eliminating any theoretical risk from introducing live bacteria into immunocompromised individuals.
If you're considering an Akkermansia supplement, our Akkermansia 60 Billion AFU uses a pasteurised formulation designed with stability and quality in mind.
Who Should Exercise Caution?
While Akkermansia is safe for most healthy adults, certain groups should consult a healthcare professional before supplementing:
- Immunocompromised individuals: People on immunosuppressive medications, undergoing chemotherapy, or with conditions affecting immune function should seek medical advice before taking any probiotic or live/pasteurised bacterial supplement.
- Those with active inflammatory bowel disease (IBD): While Akkermansia is associated with gut barrier repair, individuals with active Crohn’s disease or ulcerative colitis should discuss supplementation with their gastroenterologist, as the microbiome dynamics in active IBD are complex.
- Pregnant or breastfeeding women: Insufficient data exists to confirm safety in pregnancy; medical advice is recommended.
- Those on prescription medications: As with any supplement, consult your GP if you are taking prescription drugs, particularly immunosuppressants or biologics.
How to Minimise the Risk of Digestive Discomfort
If you experience mild digestive changes when starting Akkermansia, these strategies can help:
- Start with a lower dose and build up gradually over 1–2 weeks
- Take with food rather than on an empty stomach
- Stay consistent — most transient effects resolve as the gut microbiome adjusts
-
Support with prebiotics — foods rich in polyphenols (pomegranate, cranberry, green tea) and prebiotic fibres (inulin, FOS) help Akkermansia establish and thrive
Key Takeaway
✓ No serious adverse effects reported in human clinical trials
✓ Mild digestive symptoms are uncommon and usually temporary
✓ Pasteurised Akkermansia has the strongest clinical evidence
✓ Speak to your healthcare professional if pregnant, immunocompromised, or taking prescription medication
Frequently Asked Questions
Is Akkermansia safe to take every day?
Based on the available human clinical trials, daily Akkermansia supplementation appears to be safe and well tolerated in healthy adults. Studies lasting up to 12 weeks have not reported any serious adverse effects. If you have an underlying medical condition or take prescription medications, it's best to consult a healthcare professional before starting any new supplement.
If you're new to Akkermansia and want to understand exactly what it is, how it works, and why researchers are studying it, read our What Is Akkermansia Muciniphila? Benefits, Uses & Research (2026) guide.
Can Akkermansia cause bloating?
Some people may experience mild bloating or digestive changes when first starting Akkermansia. These effects are generally temporary and may reflect the gut microbiome adapting to the introduction of a new bacterial strain. Symptoms often settle within one to two weeks.
Can Akkermansia cause diarrhoea?
Loose stools have been reported by a small number of participants in clinical studies, although they appear to be uncommon and usually temporary. Taking Akkermansia with food and staying well hydrated may help reduce digestive discomfort during the first few days.
Is pasteurised Akkermansia better than live Akkermansia?
Current human research suggests that pasteurised Akkermansia may offer greater metabolic benefits than the live form while remaining well tolerated. In the landmark 2019 clinical trial, pasteurised Akkermansia showed improvements in several metabolic markers, although both forms demonstrated favourable safety profiles.
If you're comparing different formulations, strengths, and brands, you may also find our Top 10 Akkermansia Supplements in 2026 (Ranked & Reviewed) helpful before choosing a supplement.
Who should not take Akkermansia?
Most healthy adults can take Akkermansia safely, but people who are pregnant, breastfeeding, immunocompromised, or living with complex medical conditions should seek medical advice before using any probiotic or microbiome supplement. If you take prescription medications, speak with your healthcare professional before starting supplementation.
How long does it take for Akkermansia to work?
The time frame can vary depending on the individual and the outcome being measured. Most clinical studies have evaluated Akkermansia over periods of 8–12 weeks, so any effects are unlikely to be immediate. Consistency is generally more important than expecting rapid changes.
If you're specifically interested in whether Akkermansia may support weight management, we've reviewed the current human research in our guide Does Akkermansia Help With Weight Loss? What the Science Says (2026).
Can I take Akkermansia with other probiotics?
For most healthy adults, Akkermansia can be taken alongside other probiotic supplements. As the strains perform different functions within the gut microbiome, they are not necessarily mutually exclusive. If you have a medical condition or are taking medications, consult a healthcare professional before combining supplements.
What is the most common side effect of Akkermansia?
The most commonly reported side effects are mild digestive symptoms such as temporary bloating, changes in bowel habits, or occasional nausea during the first few weeks of use. Serious adverse effects have not been reported in published human clinical trials to date.
Can you take Akkermansia on an empty stomach?
Most people tolerate Akkermansia well whether taken with or without food. However, anyone experiencing mild nausea when first starting may prefer taking it alongside a meal. Follow the directions provided with your chosen supplement and seek advice from a healthcare professional if you have any concerns.
The Bottom Line
Based on the available clinical evidence, Akkermansia muciniphila supplementation is safe and well-tolerated in healthy adults. Serious adverse effects have not been reported in any published human trial. Mild, transient digestive changes are the most commonly noted side effect, consistent with other probiotic supplements, and typically resolve within the first two weeks.
Pasteurised Akkermansia — the form used in the most rigorous clinical trials — has the strongest safety and efficacy profile. As always, those with underlying health conditions or on prescription medications should consult a healthcare professional before starting any new supplement.
Ready to support your gut microbiome? Explore our Akkermansia 60 Billion AFU or the complete Longevity Bundle for a comprehensive approach to healthy ageing.
References
- Depommier C, Everard A, Druart C, et al. Supplementation with Akkermansia muciniphila in overweight and obese human volunteers: a proof-of-concept exploratory study. Nature Medicine. 2019;25(7):1096–1103. doi:10.1038/s41591-019-0495-2.
- Cani PD, Depommier C, Derrien M, et al. Akkermansia muciniphila: paradigm for next-generation beneficial microorganisms. Nature Reviews Gastroenterology & Hepatology. 2022;19:625–637. doi:10.1038/s41575-022-00631-9.
- EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA). Safety of pasteurised Akkermansia muciniphila as a novel food pursuant to Regulation (EU) 2015/2283. EFSA Journal. 2021;19(9):6780. doi:10.2903/j.efsa.2021.6780.