&ampnbsp;NOW&ampreg; Ubiquinol CoQH-CF&amptrade; 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.&ampnbsp; The addition of d-Limonene to this product naturally improves its solubility, which further enhances intestinal absorption, and thereby provides superior overall biological value.&ampnbsp; Coenzyme Q10 is present in almost all cells, where it is necessary for mitochondrial energy production.&ampnbsp; The body's highest concentrations of CoQ10&ampnbsp;are found in the heart, where constant chemical energy availability is imperative.&ampnbsp; 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.*