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 Get Rid of Fishy L Carnitine Smell: Essential Fixes Tonum The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions Does Carnitine Cause Body Odor? Lume Deodorant Urine smells like fish: Causes and treatment L Carnitine Fumarate Olympian Labs