L carnitine what it is, properties, effects on weight loss + opinions 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. Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements Any advice for fishy smell with L carnitine? 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