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. Treatments of trimethylaminuria: where we are and where we might be heading ScienceDirect Breakthrough in studying the enzyme that ultimately produces fish odor syndrome EurekAlert! Does Carnitine Cause Body Odor? Lume Deodorant Scientists make breakthrough in studying the enzyme involved in fish odor syndrome Effect of dietary fiber on trimethylamine N oxide production after beef consumption and on gut microbiota: MEATMARK a randomized cross over study European Journal of Clinical Nutrition