CUD Deficiency Primary Carnitine Deficiency What's the Difference Between CLA and Carnitine? What Is L Carnitine? How Could It Help With Weight Management? Wellness Hub Acetyl L Carnitine Allergy: Symptoms and Treatment Options (2026) Wyndly 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.