What have we here? A man or a fish? The Lancet Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications 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 Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Trimethylaminuria: Understanding and Treating Fish Odor Syndrome