Role of carnitine in disease Nutrition & Metabolism Springer Nature Link ThyroSoothe L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports 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.