L carnitine tartrate supplementation in the fight against infectious disease Is it safe to take L carnitine with levothyroxine (thyroid medication)? 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 L Tartrate: 8 Key Benefits Dr. Lam L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Understanding the Role of Carnitine in TPN and IDPN Therapy