Salt form of skin-replenishing ingredient hyaluronic acid; considered more effective for skin than pure hyaluronic acid due to its greater compatibility.
References for this information:
Journal of Cosmetic Dermatology, July 2014, pages 277-287
Journal of Clinical and Aesthetic Dermatology, October 2012, pages 20-23
DermatoEndocrinology, July-December 2012, pages 253-258
Journal of Drugs in Dermatology, September 2011, pages 990-1000