Trimethylaminuria, or fish odour syndrome is an uncommon condition that causes an unpleasant, fishy smell. The body is unable to turn a strong smelling chemical called trimethylamine produced in the gut when Correlation between the trimethylamine (TMA) concentration and the Download Scientific Diagram Human model of primary carnitine deficiency cardiomyopathy reveals ferroptosis as a novel mechanism: Stem Cell Reports 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. Unlocking the Health Benefits of L Carnitine and Potential Side Effects Your Health Magazine Investigating the Association between Low Trimethylamine N Oxide Level TACG Dove Medical Press