Amazon.com: Nutricost Acetyl L Carnitine (ALCAR) 500mg, 180 Capsules, 180 Servings Non GMO and Gluten Free, 1 Capsule per Serving : Everything Else L carnitine supplements can cause a fishy odor in the breath, sweat, and urine. This is likely due to the formation of trimethylamine (TMA). TMA is also responsible for the pungent smell of Product question] Okay so apparently it's not just me Has anyone here experienced the weird smell? : r SkincareAddiction 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. Omega Healthy Heart Dog & Cat Cardio Support VetriScience 100% Pure L Carnitine by Genetix Nutrition Essentials Nutrition Warehouse