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. 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 acetyl carnitine helpful short term L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal