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 Is fish smelly? If you have ever caught fresh fish, you know that it doesn't have a particularly strong odor, maybe a hint of ocean water. But when fish are killed, bacteria L Carnitine is not a magic fat burner , It wont melt fat, build muscle, or replace hard work., The only thing it burns is your money , Stick to the basics Nutrition, Training & Consistency. Pharmacological use of l carnitine in uremic anemia: Has its full potential been exploited? ScienceDirect What is Carnitine?