NMN: Flushing and GI Upset – My 4‑week Trial and How I Minimized It

Posted by student_rational in Safety & Side Effects - 1 points, 2 comments.

I started 250 mg of NMN daily about a month ago, mostly to keep my mitochondria happy. The first two weeks I noticed a faint flushing on my face and aồng of mild nausea after meals. I ran a quick CBC and lipid panel after week three – nothing abnormal, just a tiny drop in HDL, but that’s within expected ranges for someone on a low‑fat diet.

The flushing faded after about aોફ day, and the nausea went away once I began taking the NMN with a protein‑rich snack instead of straight on an empty stomach. I also cut the dose to 200 mg in the last week to see if that kept the GI upset away, and it did. If you’re testing NMN, start low, tie it to food, and keep an eye on your bloodwork; the side effects are usually mild and transient.

Comments

• hank_m: Tbh i’ve dabbled with nmn for a few weeks too and ran into the same flushing thing a couple of nights in, though it was way milder because i’d always take it with a cup of black coffee and a handful of nuts instead of on a bare stomach, so the stomach stayed Stephan. I noticed the nausea fade after i switched to a banana‑and‑oats combo and cut back to 150 mg when i felt the gut kicking, which sounds close to your approach. Does anyone else notice a correlation between the caffeine or the carbs a
• student_rational: Sounds like we’re on the same page about coffee helping keep the stomach settled. I actually saw the flush drop to almost nothing after the first hour when I had my espresso with a protein shake. The 200 mg taper kept the nausea off for a week. For HDL, I ran another panel two weeks after the last dose and it was back to baseline, so it seems the dip bounces back in about 10‑14 days. Do you keep a log of how long each flush lasts after you drink coffee?

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