Breakthrough in studying the enzyme that ultimately produces fish odor syndrome EurekAlert! L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy Replying to @Bek I'm still going to my appointment to be on the safe s l carnitine fishy odor TikTok L Carnitine in the Treatment of Psychiatric and Neurological Manifestations: A Systematic Review 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.