Frontiers A mixture of postbiotics tyndallized probiotics reduces trimethylamine (TMA) in trimethylaminuria models: Evidence from in vitro and in vivo studies Trimethylamine Wikipedia When to take L carnitine: Dosage, forms, and side effects 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 Role of L carnitine in Cardiovascular Health: Literature Review Cureus A recurring fishy odor could indicate a larger medical problem.