The hyaluronic acid in Restylane, although biosynthetically
produced (formed of chemical compounds by the enzyme action of living organisms), is almost identical to that in
all living organisms. Hyaluronic acid is a structural component of skin that creates volume and shape.
Concentrations of hyaluronic acid throughout the body decline with age, causing undesirable changes in the skin.
Restylane binds to water and provides volume to easily fill in larger folds of skin left by tissue loss around the
mouth and cheeks. "This makes it a structural action," says Rhodes, "much like a chin implant."
In contrast, cosmetics are defined as substances that
cleanse, beautify, promote attractiveness, or alter the appearance, without affecting the body's structure or
function. This definition includes skin-care products such as creams, lotions, powders and sprays; perfume;
lipstick; fingernail polish; and more.