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. Acetyl L Carnitine Supplement: Uses, Benefits, Side Effects, Dosage, A Welltopia Pharmacy L Carnitine is not a magic fat burner It won't melt fat, build muscle, or replace hard work. The only thing it burns is your money Stick to the basics 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 TMAU: Diet to reduce a fishy odour Dietitian's Life