Liquid L Carnitine Energy, Metabolism & Fat Burning 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. Force Factor Acetyl L Carnitine 500 mg 100 Vegetable Capsules Vitacost When to Take L Carnitine for Optimal Training Benefits Transparent Labs Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome