A recurring fishy odor could indicate a larger medical problem. L carnitine supplements can cause a fishy odor in the breath, sweat, and urine. This is likely due to the formation of trimethylamine (TMA). TMA is also responsible for the pungent smell of L Carnitine Avoid Fishy Smell TikTok Does Carnitine Cause Body Odor? Lume Deodorant Ultra L carnitine making me reek of rotting fish for 48 hours #lcarnitine #fishy #smell #trauma #fyp