L carnitine 300 mg mL Syrup ( L Carnitine ) 30 mL Re3aya Pharmacy L Carnitine Linus Pauling Institute Oregon State University 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 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. L Carnitine: Everything You Need to Know L Carnitine Warning Smelly Sweat : r moreplatesmoredates