L Carnitine: Everything You Need to Know Battling Reductive Stress: Pyruvate and L Carnitine Fire In A Bottle Does Carnitine Cause Body Odor? Lume Deodorant How to Get Rid of Fish Smell in the House Apartment Therapy 4 Ways to Get Fish Smell off Your Hands wikiHow 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.