Get Rid of Fishy L Carnitine Smell: Essential Fixes Tonum 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 Carnitine: Health Benefits, Supplement Uses, Side Effects, Daily Intake What is Carnitine? Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health