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The takeaway
Sulfur burps are exactly what they sound like: burps scented by hydrogen sulfide gas. They can pop up more often when you’re on GLP-1 medications because your digestion is moving in slow motion, giving that gas more time to form.
Want the full story on why burping happens on Mounjaro or Ozempic, from the science to the red flags? Read our complete guide to burping on GLP-1s here.
Why does it happen more on GLP-1s?
Medications like Mounjaro and Ozempic deliberately slow down your stomach emptying. That’s part of how they help you feel fuller for longer and eat less. The flip side is that the longer food sits in your stomach, the greater chance there is for gases to build up, including the sulfur kind.
Not everyone will get them; some people just burp more often, while others notice nothing at all. But if your burps smell stronger or stranger than usual on these meds, you’re definitely not alone.
Gross but harmless (most of the time)
Sulfur burps might be embarrassing, but they’re usually harmless. Think of them as a side effect of a slower digestive process, not a sign that something’s seriously wrong.
That said, if your burps are constant, very foul-smelling, or come with symptoms like vomiting, diarrhoea, or severe bloating, it’s worth checking in with your prescriber just to be safe.
If you’ve ever let out a burp on Mounjaro or Ozempic and thought, Wow, that smells like rotten eggs, you’ve just met the infamous sulfur burp. Not the most glamorous side effect, but definitely one worth understanding.
So… what exactly is a sulfur burp?
A sulfur burp is just a normal burp with a little extra stink. That smell comes from hydrogen sulfide gas, the same gas that makes rotten eggs reek. It’s produced naturally in your gut when bacteria break down certain foods, especially those rich in sulfur, like onions, garlic, broccoli, and eggs themselves.
Most of the time, your digestive system moves things along quickly enough that you don’t notice it. But when digestion slows down, like it does on GLP-1 medications, bacteria get more time to go to work, which can mean more hydrogen sulfide hanging around. Cue the eggy burp.
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Nick M
Published:
26 Aug 2025
Updated:
6 Oct 2025
What Sulfur Burps Actually Are (and Why They Smell Like Eggs)
Staying On Track
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Helpful Companions For Your Weight Loss Journey
From meal ideas to daily tracking, these digital tools are designed to make life on GLP-1s a little easier.
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