Omega Healthy Heart Dog & Cat Cardio Support VetriScience 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 Should I Take L Carnitine? NZProtein L Carnitine Warning Smelly Sweat : r moreplatesmoredates Cutler Nutrition Liquid L Carnitine Supplement Pre Workout Energy & Muscle eBay