L Carnitine is Underrated. New Meta Review Reminds Us Why. Acetyl L Carnitine Supplement: Uses, Benefits, Side Effects, Dosage, A Welltopia Pharmacy Acetyl L Carnitine Supplement: Uses, Benefits, Side Effects, Dosage, A Welltopia Pharmacy 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).