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 L Carnitine Warning Smelly Sweat : r moreplatesmoredates L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy L Theanine Vs L Carnitine: Can We Combine Them? Vinatura Supplements Omega Healthy Heart Dog & Cat Cardio Support VetriScience