Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Does Carnitine Cause Body Odor? Lume Deodorant Trimethylaminuria (Fish Odor Syndrome or TMAU) 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. 250g (8.8oz) NEW 100% PURE ACETYL L CARNITINE (ALCAR) 857930006264 eBay 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