L Carnitine is Underrated. New Meta Review Reminds Us Why. Liquid L Carnitine Energy, Metabolism & Fat Burning The leading ingredient in any energy drink is usually caffeine. Most of them contain herbs, caffeine, and other substances. Many energy drink brands claim to be supplements. The FDA doesn't approve energy Acetyl L Carnitine Vs L Carnitine Explained Australian Sports Nutrition What is L Carnitine and what does it do? VPA Australia MCT oil is a supplement made from a type of fat called medium chain triglycerides. MCT molecules are smaller than those in most of the fats you eat, which are long chain triglycerides (LCT).