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Can L Carnitine Cause Side Effects? Truth vs Myths Explained (2026 Guide) 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 side effects fishy odor trimethylamine evidence Effect of dietary fiber on trimethylamine N oxide FISH ODOR SYNDROME (TRIMETHYLAMINURIA), Causes, Signs and Symptoms, Diagnosis and Treatment. YouTube
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