Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal 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 3000, Orange Mango, 15.72 fl oz (465 ml) L carnitine containing food. Groups of healthy products containing vitamins and minerals. Set of fruits, vegetables, meats, fish and dairy Stock Vector Image & Art Alamy