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. Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal L Carnitine500, 500 mg, 120 Capsules L carnitine 300 mg mL Syrup ( L Carnitine ) 30 mL Re3aya Pharmacy 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