l carnitine 800 mg 100 caps Macrobitica Santa Ana 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 Fishy Odor Syndrome (Trimethylaminuria): Causes, Symptoms, Diagnosis, and Treatment Mister Blister Trimethylamine N Oxide From Gut Microbiota in Chronic Kidney Disease Patients: Focus on Diet Journal of Renal Nutrition