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 supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis Carnitine and Thyroid Disease page 1 Life Extension