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Sulfur burps are burps that smell like rotten eggs. The smell comes from hydrogen sulfide, a gas that gut bacteria make when they break down sulfur-containing compounds from food. An occasional sulfur burp after a big, protein-heavy or fizzy meal is usually harmless. They have become a common complaint among people taking GLP-1 medicines such as Ozempic, Wegovy, Mounjaro and Zepbound: every U.S. label in the class lists belching (eructation) as a side effect, for example 7% on Wegovy versus under 1% on placebo. The labels do not record whether burps smell, and no study has measured that directly. Burping with severe belly pain, vomiting, fever or diarrhea that will not settle needs a call to a clinician.
Peptide Labs does not sell Ozempic, Wegovy, Mounjaro, Zepbound or any prescription drug. This article summarizes FDA labels, government health pages and published research. For every effect in the class, see our guide to side effects across the GLP-1 class.
Key Takeaways
- The rotten-egg smell of sulfur burps comes from hydrogen sulfide made by gut bacteria.
- Belching itself is normal: NIDDK says people burp up to 30 times a day.
- GLP-1 labels list belching in under 1% to 8% of users, versus 0% to 1% on placebo.
- No study has measured sulfur-smelling burps on GLP-1 medicines; the link is plausible, not proven.
- Smaller, slower, lower-fat meals and fewer fizzy drinks are the usual first steps.
- Sulfur burps with diarrhea, greasy stools, cramps or weight loss are worth checking with a clinician.
What causes sulfur burps?
To answer what causes sulfur burps, start with ordinary burping. NIDDK, part of the National Institutes of Health, describes a belch as a release of gas from the stomach through the mouth and notes that people burp up to 30 times a day. Most of that gas is swallowed air. You swallow more air when you chew gum, suck on hard candy, drink carbonated drinks, eat or drink quickly, smoke or wear loose dentures.
The sulfur smell is a different matter. Hydrogen sulfide is produced in the digestive tract mainly by sulfate-reducing bacteria, with a further share from other bacteria that break down the amino acid cysteine, according to a 2017 review in Digestive Diseases and Sciences. In a small controlled feeding study published in the American Journal of Clinical Nutrition in 2000, five healthy men ate diets ranging from no meat to a very high meat intake for 10 days each, and sulfide in their stool rose steadily with meat intake. That research looked at the large intestine. Why some burps carry the smell has barely been studied, so explanations online are partly educated guesswork.
Foods and drinks linked to sulfur burps
Food lists for sulfur burps mix firm facts with assumptions. The table separates what the sources show from what is commonly suggested.
| Possible trigger | Why it may matter | Strength of evidence |
|---|---|---|
| Meat and other protein-rich foods | Supply sulfur-containing amino acids that gut bacteria turn into sulfide | Small feeding study (5 men, stool sulfide) |
| Eggs | Rich in sulfur-containing protein | Plausible; no burp-specific study |
| Broccoli, cauliflower, kale, cabbage | Contain sulfur compounds called glucosinolates; NIDDK lists them as gassy | Gas link documented; burp odor not studied |
| Beans, peas, lentils | Fermented by gut bacteria; NIDDK lists them as gassy | Gas link documented |
| Fizzy drinks and beer | Add swallowed gas, so more burping | NIDDK lists carbonated drinks |
| Sugar alcohols (sorbitol, xylitol, erythritol) | Poorly absorbed and fermented; NIDDK lists them | Gas link documented |
| Large or high-fat meals | Sit longer in the stomach; NIDDK says fat may increase bloating | General guidance |
A food diary is the simplest way to find your own triggers. Many of these foods are nutritious, so cutting back for a while and reintroducing them is usually more sensible than dropping them for good.
Ozempic burps: what the labels say
Ozempic burps are real in the sense that belching shows up in every GLP-1 label. The figures below come from each label’s placebo-controlled trials. Ranges span the maintenance strengths, and trial populations differ, so read them as context rather than a ranking.
| Drug (approved use) | Belching (eructation): drug vs placebo | Label revision |
|---|---|---|
| Ozempic injection (type 2 diabetes) | 1.1% to 2.7% vs 0% | May 2026 |
| Rybelsus and Ozempic tablets (type 2 diabetes) | 0.6% to 2% vs 0% | January 2026 |
| Wegovy injection (weight management) | 7% vs under 1% | June 2026 |
| Saxenda (weight management) | 4.5% vs 0.2% | February 2026 |
| Mounjaro (type 2 diabetes) | 2.5% to 3.3% vs 0.4% | August 2026 |
| Zepbound (weight management) | 4% to 5% vs 1% | August 2026 |
| Foundayo tablets (weight management) | 6% to 8% vs 1% | July 2026 |
Indigestion runs alongside it. Dyspepsia was reported by 9% on Wegovy versus 3% on placebo and by 9% to 10% on Zepbound versus 4%, and reflux (GERD) appears on these labels too. The Wegovy and Foundayo Medication Guides list belching, gas, heartburn and feeling bloated among the most common side effects.
Why GLP-1 medicines may cause Ozempic sulfur burps
The labels state that semaglutide and tirzepatide delay gastric emptying, so a meal stays in the stomach longer. A common explanation for Ozempic sulfur burps is that food sitting longer gives bacteria more time to produce gas, including hydrogen sulfide. That is a reasonable hypothesis, but no trial has tested it, and the label tables count belching without describing its smell.
Reports tend to follow the same pattern as other digestive effects. The labels say nausea, vomiting and diarrhea mostly occur while the medicine is being stepped up and decrease over time. If burping starts or worsens after an increase in strength, mention it to your prescriber, who may keep you at a lower strength for longer. Related effects are covered in our guides to nausea on Ozempic, constipation on Ozempic and diarrhea on GLP-1 drugs.
Habits that may reduce burping
There is no tested remedy for sulfur burps, but NIDDK’s advice for gas and a 2022 expert consensus on GLP-1 digestive effects (Journal of Clinical Medicine; most authors reported manufacturer fees) point to the same habits:
- Eat slowly while seated, and avoid talking while you chew.
- Choose smaller meals and stop as soon as you feel full; overfilling a slow stomach makes symptoms worse.
- Limit fizzy drinks, chewing gum, hard candy and drinking through straws, which add swallowed air.
- Try cutting back on the foods in the table above for a week or two, one group at a time.
- Avoid lying down soon after eating and avoid large meals close to bedtime.
- Go easy on alcohol, including beer; our guide to GLP-1 drugs and alcohol explains why it can add to stomach upset.
For bloating that comes with the burps, see our guides on reducing bloating and what probiotic research shows for bloating. Ideas for smaller, protein-adequate meals are in our eating guide for GLP-1 medicines. Ask a pharmacist before taking any over-the-counter antacid or gas product, because GLP-1 medicines can change how quickly oral medicines are absorbed.
Other causes worth checking with a clinician
Sulfur burps are not always about diet or medicine. These conditions need a proper diagnosis, so read the list as reasons to book an appointment rather than to self-diagnose:
- Reflux and indigestion. Heartburn, a sour taste or upper belly discomfort alongside burping. Both are listed on GLP-1 labels.
- Giardiasis. A parasite infection; CDC lists diarrhea, gas, smelly greasy stools that can float, stomach cramps and nausea. Symptoms usually start 1 to 2 weeks after exposure and typically last 2 to 6 weeks.
- Small intestinal bacterial overgrowth (SIBO). MedlinePlus lists abdominal fullness, pain, bloating, watery diarrhea and gassiness; doctors use hydrogen and methane breath tests to check for it.
Red flags
NIDDK advises seeing a doctor if gas symptoms bother you, change suddenly, or come with abdominal pain, constipation, diarrhea or weight loss. People on GLP-1 medicines should also know the warning signs in the Medication Guides:
- Severe stomach pain that will not go away, with or without vomiting, sometimes spreading to the back.
- Pain in the upper stomach with fever, yellowing of the skin or eyes, or clay-colored stools.
- Vomiting or diarrhea that does not stop, or signs of dehydration such as dark urine and dizziness.
- Losing weight faster than expected or without trying, or blood in the stool.
Frequently Asked Questions
What causes sulfur burps?
The rotten-egg smell comes from hydrogen sulfide, a gas gut bacteria make from sulfur-containing compounds in food. Protein-rich meals, fizzy drinks, large meals and slowed digestion may all play a part.
Why does Ozempic cause burps?
Semaglutide slows stomach emptying, and belching is listed on its label. Whether that slower emptying explains the sulfur smell has not been studied.
How common are Ozempic burps?
In the Ozempic label’s diabetes trials, 1.1% to 2.7% reported belching versus 0% on placebo. The figure was 7% versus under 1% for Wegovy in weight-management trials.
Do Mounjaro and Zepbound cause sulfur burps too?
Both labels list belching: 2.5% to 3.3% on Mounjaro versus 0.4% on placebo, and 4% to 5% on Zepbound versus 1%. Odor was not recorded.
Which foods make sulfur burps worse?
People often point to meat, eggs, cruciferous vegetables, beans, beer and fizzy drinks. Only some of these links are studied, so a food diary is the most reliable guide.
When should I see a doctor about sulfur burps?
See a clinician if burps come with diarrhea, greasy stools, cramps, weight loss, persistent heartburn, severe belly pain or fever, or if they change suddenly.
Peptide Labs does not sell GLP-1 medicines or any prescription drug. This article is general information, not medical advice. Read the Medication Guide that comes with a prescription, and ask a pharmacist or prescriber how this information applies to you.
Last reviewed October 2026.
Related guides: Ozempic Nausea: How Long It Lasts and What Helps, GLP-1 Side Effects: What Every GLP-1 Drug Label Warns About, How to Debloat: Common Causes of Bloating, What Helps and When to See a Doctor, Ozempic Heartburn and Acid Reflux: What the Labels Say, Ozempic Teeth: Dry Mouth, Enamel and What the Evidence Shows.