Carnitine for your metabolism TISSO Naturprodukte L Carnitine ELITE BURN Breakthrough in studying the enzyme that ultimately produces fish odor syndrome EurekAlert! L Carnitine Male Enhancement: What the Evidence Shows for Energy, Sperm Health, and Performance L carnitine supplements can cause a fishy odor in the breath, sweat, and urine. This is likely due to the formation of trimethylamine (TMA). TMA is also responsible for the pungent smell of