Gamma Butyrobetaine an overview ScienceDirect Topics 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. Carnitine Molecule of the Month September 2003 PDF) [L carnitine treatment and fish odor syndrome: an unwaited adverse effect]. Unraveling the Formation Mechanisms of Trimethylamine N Oxide and Its Inhibition by Food Ingredients: Toward Cardioprotective Food Development Journal of Agricultural and Food Chemistry Amazon.com: Nutricost Acetyl L Carnitine (ALCAR) 500mg, 180 Capsules, 180 Servings Non GMO and Gluten Free, 1 Capsule per Serving : Everything Else