Hyaluronic acid is a naturally occurring sugar. It is found in the human body in the skin, cartilage, joints and the eye. In skin tissue, hyaluronic acid fills the space between collagen and elastin fibers. The role of hyaluronic acid in skin is to deliver nutrients, hydrate the skin by holding in water, and to act as a cushioning agent. Derma-Filler works very effectively on the nerve signals, educing their intensity, so that the facial muscles won't contract any more, and therefore the wrinkles and lines on the skin overlying these muscles will not appear.