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. Does Carnitine Cause Body Odor? Lume Deodorant L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health Potential Adverse Effects of L Carnitine Marnys Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis