Trimethylaminuria (Fish Odor Syndrome or TMAU) I take L Carnitine for weight loss, it says not to take more then 1g per day, but I read online that i should have 2 4g per day to lose weight. What is correct? : r Nootropics 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 Spring Valley L Carnitine Amino Acid Dietary Supplement Tablets for Heart Health, 500 mg, 30 Count HSA FSA Eligible Walmart.com