Collagen, elastin and glycosaminoglycans (GAGs) each contribute to skin appearance. Collagen provides a structural matrix, or scaffold, that forms the foundation of the skin. Elastin gives the skin its resiliency and elasticity. Hyaluronic acid (HA) and other glycosaminoglycans draw water into the skin giving it volume. In addition, HA helps bind collagen and elastin into a supportive matrix that gives the skin its structure