Trimethylaminuria: FMO3 mutations that cause malodorous body odor Scientists make breakthrough in studying the enzyme involved in fish odor syndrome Acetyl L Carnitine: Benefits, Forms, Dosing, and Side Effects Dr Brad Stanfield 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. Trimethylaminuria: Understanding and Treating Fish Odor Syndrome Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications