NOW Ubiquinol contains the reduced form of CoQ10 (Coenzyme Q10) which has been shown in scientific studies to be a highly bioavailable and active antioxidant form of CoQ10. The addition of MCT Oil (medium chain triglycerides) to this product naturally improves its solubility, which further enhances intestinal absorption, and thereby provides superior overall biological value. Coenzyme Q10 is present in almost all cells, where it is necessary for mitochondrial energy production. The body's highest concentrations of CoQ19 are found in the heart, where constant chemical energy availability is imperative. In addition to its benefits for cardiac function through energy production, CoQ10 also functions as a powerful fat soluble antioxidant, providing protection against free radical attack for vascular structures, as well as for other tissues, including the brain and neurons.