CUD Deficiency Primary Carnitine Deficiency Potential Adverse Effects of L Carnitine Marnys Acetyl L Carnitine Allergy: Symptoms and Treatment Options (2026) Wyndly L Carnitine: Unveiling the Science Behind its Role in Effective Weight Loss Aesthetics 360 Lash & MedSpa 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.