The Best Weight Loss Supplements for Hashimoto's Patients 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 Did you miss this article on John Meadows' www.mountaindogdiet.com ? Dancing with the Devil: L Carnitine (TLDR: L Carnitine might a actually be counteracting your fat loss by *blocking* thyroid action. More is not