Why does it smell like eggs — sulfur burps on sema and what actually helps
8 posts
I am not exaggerating when I say my burps smell like a rotten boiled egg locker room. I want to know two things: 1) what's the mechanism, 2) what the hell actually works because Google gives me a useless list of 'stay hydrated.'
My context: 0.5mg sema, week 6. Started at 0.25 and the burps were mild. Increased to 0.5 and my partner has started fake-coughing when I exhale. It's humbling.
What I've tried:
- Hydration — zero effect.
- Less sulfur-rich food (cruciferous, eggs, red meat) — modest effect, burps still smelly, just less frequent.
- Pepto Bismol before meals — actually noticeable improvement. Mechanism something about binding sulfides I think.
- Famotidine 20mg — didn't do much for the smell, did help general GI.
- Digestive enzymes w/ meals — placebo territory for me.
What's working for you? And does this go away or is this my life on sema now?
15 Replies
19 posts
The mechanism is real. Sema slows gastric emptying, food sits longer, sulfur-producing bacteria have more substrate and time to make hydrogen sulfide. That's the rotten-egg smell. Less food in stomach = less smell. Pepto Bismol (bismuth subsalicylate) literally binds sulfides into bismuth sulfide, which is black and inert. That's why your stool might also go dark while using it — normal.
31 posts
Smaller meals. This is the single biggest lever nobody wants to hear. If you eat 800 kcal in one sitting on sema, that food is going to hang out for hours. Split into 400 + 400 and the smell drops by half, in my experience.
28 posts
For me sulfur burps went away by week 10-12. Not gone, just not weaponized. I think the gut microbiome adapts to the slower transit over a couple months. Hang in there.
- Semaglutide · 1.7 mg · weekly · sub-Q
8 posts
@fridge_protein that mechanism explanation is the most useful thing I've read all week. Thank you. Going to double down on Pepto and smaller meals and accept the black stool.
36 posts
Underrated: cut eggs and red meat for 48h before the expected peak (day 2-4 post-injection). That's when I get the worst of it. Outside that window I can eat normally. The peak window is when gastric emptying is slowest.
26 posts
Activated charcoal caps — 500mg with the offending meal. Binds the H2S. Don't take it with your sema injection day meds or anything else you need absorbed. Works for me when I have to travel and can't avoid buffet food.
- DSIP · 100 mcg · pre-bed · sub-Q
- Epithalon · 10 mg · 10d cycles · sub-Q
115 posts
Activated charcoal does bind non-specifically. So yes it'll bind sulfides and also your multivitamin and whatever medication you took two hours ago. Fine as rescue, bad as routine.
27 posts
My partner made me read this thread out loud over breakfast as punishment. For the record: hydrogen sulfide burps went away at week 8 for me, held there ever since on 1.0.
25 posts
Zofran for the nausea that tends to come WITH the sulfur burps for me. Doesn't help smell, does help being able to function during the worst days.
8 posts
Update a week in: Pepto before each meal + meal splitting has cut it 70%. Partner no longer fake-coughs. Marriage saved by this thread.
19 posts
@sulfur_shrug good outcome. One more tip for when it's back: peppermint tea post-meal genuinely helps motility a bit. Not magic but real.
22 posts
205 posts
Secondary point — if sulfur burps are accompanied by upper abdominal pain that doesn't go away, get labs (lipase, amylase) and don't wait. Most sulfur burps are benign gastric slowdown. Rarely they're a signal of something that needs eyes on it.
- CJC-1295 no DAC · 100 mcg · pre-bed · sub-Q
- Ipamorelin · 200 mcg · pre-bed · sub-Q
- BPC-157 · 500 mcg · 2x/day · sub-Q
8 posts
Saving. This thread is going to help more people than any label insert.