I'm a young woman with TMAU (Fishy Odor Syndrome) does anyone have some supplements suggestions for me? Yes I've been to the doctors, specialists and psych, they tell me nothing is wrong, 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 100% Pure L Carnitine by Genetix Nutrition Essentials Nutrition Warehouse Does Carnitine Cause Body Odor? Lume Deodorant