CoQ10 is a nutrient that supports both heart functioning and possibly retinal function. It may support retinal functioning because it enhances the capacity of mitochondria (the cellular energy producers) that operate within the pigmented cells of the retina. It is actually and enzyme which found in every cell of the body and there has the mitochondria support effect. It is known as one of the operative factors in the transport of electrons between cells and when depleted the the body's critical source of cellular energy is reduced. CoQ10 is concentrated in the liver and heart.