L Carnitine Liquid 3000mg 16 oz L Carnitine 60 tablets Foods High in Vitamin C and Why You Need It 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 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).