L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormone which is crucial to regulate the body's metabolism and growth development. There can be various causes that contribute Carnitine and Thyroid Disease page 1 Life Extension Amazon.com: Rootcology by Dr. Izabella Wentz Carnitine Blend L Carnitine & Acetyl L Carnitine Formula Ideal for Vegetarians 120 Capsules : Health & Household Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome