L Carnitine is Underrated. New Meta Review Reminds Us Why. 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 Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Difference between L Carnitine and L Carnitine L Tartrate