As the name suggests, medium-chain triglyceride (MCT) oil contains medium- length chains of fats called triglycerides. MCT oil is a popular supplement used to aid fat loss and to increase energy. What Is MCT Oil? MCT oil is a supplement made from a type of fat called medium -chain triglycerides. Medium-chain triglycerides are a type of fat that is found in certain oils and dairy products. Premium MCT Oil derived only from Non-GMO Coconuts · BENEFITS: Medium- chain triglycerides (MCTs) are a type of fat that may help your body achieve Ketosis. “MCT” is short for medium-chain triglycerides.