Anyone have experience with L Carnitine? Please share : r Supplements L Carnitine500, 500 mg, 120 Capsules Amazon.com: NOW Foods Supplements, L Carnitine 1,000 mg, Purest Form, Amino Acid, Fitness Support*, 100 Tablets : Health & Household Frontline Formulations L Carnitine Sour Gummy Worm 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.