MCT short for Medium chain triglyceride is a partially man-made fat. The name refers to the way the carbon atoms are arranged in their chemical structure. It is made by processing coconut or palm kernel oils in the laboratory. MCT oil is a supplement made of using these fats and is often used by people wanting to lose weight or boost their endurance during a workout. Some studies show MCT oil can improve the ability to think and also help with various forms of dementia.