Berberine and L Carnitine: Safety, Benefits and Dosage Guide Bolt Pharmacy 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. Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link When to take L carnitine: Dosage, forms, and side effects Trimethylaminuria: Definition, symptoms, and more Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications