Did You Know? Some people report a fishy smell after supplementing with L carnitine. This happens because certain gut bacteria convert carnitine to trimethylamine, a malodorous compound found in rotting fish. Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L Carnitine: Benefits, Risks, and Its Role in Fitness and Weight Loss WellnessPulse Boost Fat Burning with L Carnitine: A Comprehensive Guide MyMedicPlus