Carnitine C7H15NO3 CID 10917 PubChem L carnitine: properties and health benefits Marnys Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Differential effects of oral and intravenous L carnitine on serum lipids: is the microbiota the answer? 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. Trimethylamine N Oxide in Relation to Cardiometabolic HealthCause or Effect ?