IV Carnitine Therapy Energy Boost & Metabolism Support Minnerva Clinic 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 Liquid L Carnitine 3500MG Boost Your Energy Naturally Ripped Up Nutrition L CARNITINE for fat loss? A quick summary and understanding of this popular but misunderstood supplement