Vitamins to be taken away from thyroid medication L carnitine 3000 Fat Burner By Nutrakey Get Yok'd Nutrition HERO TECH NUTRITION CARNITINE 3000 Hyperpolarized [1 13C]Acetyl l Carnitine Probes Tricarboxylic Acid Cycle Activity In Vivo ACS Sensors 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.