All Natural HA Serum with Ascorbic Acid, Essential Rose. No Parabens, preservatives, fillers, thickners or anything else added. Hyaluronic acid is a Dietary Supplement used for joint health and skin health. Hyaluronic acid is found in all of the body's tissue, with the highest concentrations located in the extracellular matrix of the skin and the synovial fluid that bathes the joints and cartilage.