How Much L Carnitine Should I Take? A Guide The Science of Good Health 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 Does L Carnitine Work for Fat Loss? A Dietitian Explains Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L carnitine: Science Backed Benefits, Risks, and More L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute