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 Acetyl L carnitine is a white crystalline solid that resembles snow. It has a mild odor similar to vinegar. It is a metabolite of L carnitine, derived from the amino acid L lysine in a series iSatori Liquid L Carnitine LS3 3000 How Much L Carnitine Should I Take? A Guide The Science of Good Health Does Carnitine Cause Body Odor? Lume Deodorant