Frontiers Exogenous L carnitine Administration Ameliorates the Adverse Effects of Heat Stress on Testicular Hemodynamics, Echotexture, and Total Antioxidant Capacity in Rams L CARNITINE increases muscle mass, reduces fat mass. Bangkok Hospital Headquarter The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.