L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health L Carnitine Pills for Weight Loss: Evidence, Safety and UK Guidance Bolt Pharmacy Pharmacokinetics of L Carnitine : Clinical Pharmacokinetics 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. Dietary supplementation of l carnitine ameliorates metabolic syndrome independent of trimethylamine N oxide produced by gut microbes in high fat diet induced obese mice Food & Function (RSC Publishing)