Stabilizing the enzyme in fish odor syndrome Does Carnitine Cause Body Odor? Lume Deodorant L Carnitine in the Treatment of Psychiatric and Neurological Manifestations: A Systematic Review Acetyl L Carnitine: Benefits and Side Effects Gene Food L Carnitine for Erectile Dysfunction: What the Evidence Shows and How to Use It 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.