L Carnitine Benefits: A Complete Research Based Guide 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. L carnitine reduces hyperthyroidism symptoms L carnitine extenuates endocrine disruption, inflammatory burst and oxidative stress in carbendazim challenged male rats via upregulation of testicular StAR and FABP9, and downregulation of P38 MAPK pathways ScienceDirect