L Carnitine in the Treatment of Psychiatric and Neurological Manifestations: A Systematic Review Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link 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. L carnitine supplements can cause a fishy odor in the breath, sweat, and urine. This is likely due to the formation of trimethylamine (TMA). TMA is also responsible for the pungent smell of The effect of egg yolk trimethylamine (TMA) concentration on fishy odor Download Scientific Diagram Carnitine Molecule of the Month September 2003