Hyaluronic acid is a group of molecules called polysaccharides, found naturally in our body’s connective tissues and they work to cushion and lubricate the joints and other tissues. Also it’s known for its strong effect in hydrating skin and unbelievable ability to retain moisture. Its basic uses are to lubricate joints and tissues, hydrate and moisturize skin, reduce skin wrinkles, relieve dry eye symptoms, reduce skin wrinkles and reduce the size of leg sores caused by weak blood reduction. Hyaluronic acid can be found as serums, sheet masks, creams, moisturizers, cleansers, lip treatment, injections, pills, eye drops and mouth washers. Although hyaluronic acid is safe when used appropriately, allergic reaction might occur when taken by mouth or when applied to skin but rare. Also there is no enough reliable information about how much safe is to use hyaluronic acid for pregnant, breast feeding women, radiation therapy receiver and scleroderma patients. The dose must be taken according to the doctor’s instruction and supervision.