If you take Ozempic or Wegovy and are wondering whether a probiotic will help, the honest answer right now is that no benefit has been established. A probiotic company is studying whether its microbiome products can support people on these medicines, and CNBC reports that any potential benefit for GLP-1 users has yet to be established.
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Is there proof that probiotics help on Ozempic or Wegovy?
Not yet. Novonesis, whose human health business includes probiotic supplements, is exploring whether its microbiome products can help patients on GLP-1 medicines. In a CNBC interview published November 9, 2026, Novonesis CEO Ester Baiget said GLP-1 medicines and supplements could play complementary roles. She described the company’s study with Novo Nordisk, the maker of Wegovy and Ozempic, which is testing what she called “a unique cocktail” of pro-, pre- and post-biotics. Her words for the goal were that the company’s work could help patients on GLP-1s feel better “as a companion during the treatment.” As of November 9, 2026, CNBC describes the study with Novo Nordisk as ongoing.
CNBC’s caution is the part to keep in mind. It notes that the microbiome products Novonesis is studying are different from protein and vitamin supplements, and that any potential benefit for GLP-1 users has yet to be established. The microbiome is the community of microorganisms, including bacteria, fungi and viruses, that live in or on the body, particularly in the gut.
What is known and what is not
Both Wegovy and Ozempic contain semaglutide, but they have different FDA-approved uses. The Cleveland Clinic’s Wegovy vs. Ozempic guide lays out the differences, and the table below summarizes the probiotic question as of November 9, 2026. The American Academy of Ophthalmology also has a news release on weight-loss drugs and eye health, and Cleveland Clinic offers a Wegovy versus Ozempic infographic.
| Question | Status as of November 9, 2026 | Source |
|---|---|---|
| Does a probiotic add benefit for people on Wegovy or Ozempic? | Not established yet | CNBC |
| Novonesis study with Novo Nordisk | Ongoing | CNBC, Novonesis CEO Ester Baiget |
| Wegovy approved uses | Weight management in adults and children 12 years or older, plus MASH and cardiovascular risk reduction | Cleveland Clinic |
| Ozempic approved uses | Managing type 2 diabetes, plus related kidney and cardiovascular uses | Cleveland Clinic |
Why do protein and vitamins come up with these medicines?
CNBC reports that some research has linked GLP-1 treatment to insufficient protein intake and deficiencies in certain vitamins and minerals. It adds that how much the medicines themselves are responsible remains unclear (CNBC cites PMC12693348). CNBC draws a line between those protein and vitamin supplements and the microbiome products Novonesis is studying.
The eating side of this is worth a look. A 2026 pilot study in Nutrients by Camajani and colleagues followed 38 adults with obesity or overweight for three months, with 17 on tirzepatide and 21 on semaglutide. Participants reported substantially smaller portions (84%), and the researchers stressed nutritional monitoring, because smaller portions may compromise protein, fiber, fluid and micronutrient intake. The study had no control group and used a questionnaire that was not formally validated, so it cannot show the drugs caused the changes it recorded.
Fox News reports that federal dietary guidelines recommend 1.2 to 1.6 grams of protein per kilogram of body weight daily. It also says a joint advisory on GLP-1 treatment discusses the same range during active weight loss and stresses that targets be tailored to the individual.
CNBC also cites a PwC survey of UK adults. About 70% of GLP-1 users spent less on snacks, 40% spent more on vitamins and supplements, and more than 80% of those who stopped the medicine kept some dietary changes.
Which digestive side effects should you tell your prescriber about?
Cleveland Clinic lists nausea and vomiting, diarrhea, constipation, abdominal pain and heartburn among the common digestive side effects of semaglutide. Its guide to managing GLP-1 digestive side effects suggests smaller meals, staying hydrated and avoiding high-fat foods, and says to ask your doctor about a lower dosage if needed. Because these effects are common on the medicines, tell your prescriber about any change in your digestion before you add a supplement. Cleveland Clinic’s guide on microdosing GLP-1s says taking a smaller dose than your prescriber recommends is not a good idea, so talk to them before changing anything about your medicine.
What should you ask your prescriber?
- Given that a probiotic benefit for people on Wegovy or Ozempic has not been established, does adding one make sense for me, and can I take one with my medicine?
- What daily protein target fits my weight and health? The guideline range is tailored to the individual.
- Should any vitamin or mineral levels be checked?
- Which digestive side effects should I report, and which are expected?
- If my energy or exercise performance drops, what should I do? Fox News advises discussing changes with a doctor.
This is information to help you prepare for that conversation, not medical advice. Until the Novonesis study reports results, the most useful step is to bring these questions to your prescriber. If you want to see how probiotics differ from prebiotics first, read probiotics vs prebiotics, and for the wider research on probiotics and weight, read the science of probiotics in weight management.
By the Clinical Research Explained Editorial Team

