Does L carnitine cause fishy body odor? Surprising Truth and Solutions 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 A recurring fishy odor could indicate a larger medical problem. L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health Body odor can be impacted by diet. Foods that cause body odor include garlic, onion, asparagus, red meat, and alcoholic beverages. #bodyodor #smellgood #dermatologist