Reviva Lab has now compounded a higher level of premium Hyaluronic Acid into a precious fluid that can help raise skin"s moisture level to fill-in fullows, plup up tissues and tone-down lines. *High Potency Hyaluronic Acid Serum. *Maintain youthful, healthy looking skin. *Raise and maintain skins moisture levels. *The ultimate moisturiser for deeper lines. Directions: Apply under creams in the evening or alone to hydrate the skin.