Hyaluronic acid is a naturally occurring polysaccharide (carbohydrate) in the human body, it is present in large amounts in the spaces between skin cells, where it provides moisture, plumpness, firmness and suppleness to the skin. It is also present in the eyes and in the joint spaces, where it acts as a lubricant and ‘shock absorber.’
Skin care products containing this substance are often used with vitamin C products to assist in effective penetration. As you age, the forces of nature destroy hyaluronic acid. Diet and smoking can also affect your body's level of hyaluronic acid over time. Skin care products with hyaluronic acid are most frequently used to treat wrinkled skin.