L Carnitine Injection Levocarnitine IV 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 L Carnitine Benefits, Side Effects & Dosage SelfDecode Supplements What you eat can influence how you smell and even how attractive you seem to others. Foods like garlic, onions, and cruciferous vegetables (broccoli, cabbage) contain sulfur compounds that affect body 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. CARNITINE (L CARNITINE, ACETYLCARNITINE) Neuroneeds