Trimethylaminuria: Definition, symptoms, and more Do you or someone you love smell like fish? It could be Fish Odor Syndrome! #fishodorsyndrome #fishy #fishysmell #fishodor Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Stabilizing the enzyme in fish odor syndrome 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