Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Does Carnitine Cause Body Odor? Lume Deodorant CUD Deficiency Primary Carnitine Deficiency Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal 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 L Carnitine Help with Erectile Dysfunction?