Does Carnitine Cause Body Odor? Lume Deodorant Acetyl L Carnitine 500 mg (60 Count) Compounding Pharmacy of America How to Inject L Carnitine for Weight Loss Safely Most people talk about carnitine like it is one supplement. It is not. Acetyl L carnitine and L carnitine L tartrate do different jobs, and picking the wrong one for the wrong goal is where people 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. Figure 1: CMAJ