ResearchSafe

Quercetin GI upset at 1000mg – anyone else felt this?

Posted by runner_aaron in Safety & Side Effects - 9 points, 7 comments.

Howzit folks. I’ve been trying quercetin 500mg twice a day with my morning coffee for the past week, mainly for the antioxidant and anti‑inflammatory hype. Around day three I started noticing a bit of low‑grade stomach discomfort – not full on nausea, just a sore‑ish feeling that lingered a couple of hours after each dose.

I also got a mild headache once or twice, nothing that knocked me out but enough to make me wonder if it’s related. I’ve read that GI upset can happen at higher doses, but I’m already at the top of the usual range. Has anyone else felt similar with quercetin?

Did splitting the dose, taking it with food, or dropping to 250mg twice daily help? I’m thinking of trying a lower dose for a few days and seeing if the gut settles, but I’d love to hear what worked for you before I tweak anything. Thanks.

Comments

  • quiet_ironman: Just had a similar run with quercetin a while back 🔬. Took 500mg twice daily with coffee too, same feeling of my gut doing a slow protest 😅. For me, splitting the dose to 250mg three times a day helped calm the rumble, though I kept it with a big meal instead of coffee. The headache? Could’ve been dehydration or just my body adjusting. Lowering to 250mg twice daily did settle my stomach, but it took about a week. Just my own experience, no proof, just what my body said.
  • grinder265: Ngl I ran into the same gut rumble with quercetin 500mg BID with coffee. Dropping to 250mg TID with breakfast cleared it for me after a few days, though the headache lingered a bit till I upped water. Just my take.
  • vo2max_sleep: Yeah I felt that low‑grade gut ache too when I did 500mg twice with my espresso. Switching to 250mg three times with lunch and dinner eased it after a few days. Headache faded once I upped my water.
  • runner_aaron: I’ll try 250mg three times with lunch and dinner and see if the ache eases, plus drink more water for the headache. Did you keep your coffee or skip it with those doses?
  • runner_aaron: Howzit grinder265. TBh your 250mg TID with breakfast worked for you? I’ve been stuck at 500mg BID with coffee, and the gut feel hasn’t budged. Did the breakfast timing or the lower total daily dose actually calm things? Also, did the headache ease once the gut did?
  • runner_aaron: Howzit, quick follow-up. I did try splitting to 250mg three times a day but still had the sore gut feeling, even with meals. Yours seemed lighter after a week – did the meal timing matter more than the dose? Also, did the headache go away once you adjusted? Curious if coffee’s the culprit.
  • vo2max_sleep: Thanks for the split-dose idea – I’ll give that a shot next week. I usually took it with coffee, but maybe skipping it could help. If the discomfort eases, I’ll stick with the lower doses. Let me know if you notice any changes!

Community discussion - research and educational context only. Not medical advice.