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. The main reason why people may experience a fishy taste, smell, or burp when taking #fishoil is that they are not taking a high quality #fishoilsupplement. When it comes to manufacturing Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health When to take L carnitine: Dosage, forms, and side effects