Momentous Acetyl L Carnitine A Pilot Clinical Trial on L Carnitine Supplementation in Combination with Motivation Training: Effects on Weight Management in Healthy Volunteers The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions 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).