Glycine Propionyl L Carnitine and Erectile Dysfunction L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute 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 for fat loss? A quick summary and understanding of this popular but misunderstood supplement L Carnitine, 500 mg Veggie Capsules Jarrow Formulas