Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements Does Carnitine Cause Body Odor? Lume Deodorant 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 PDF) [L carnitine treatment and fish odor syndrome: an unwaited adverse effect]. TMAU: Diet to reduce a fishy odour Dietitian's Life