Reviva Labs Hyaluronic Acid Serum Is A Professional-Strength Hydrating Formula That Allows Skin To Gain And Retain Moisture. Our Serum Helps Raise Moisture Levels In Your Skin To Fill In Furrows, Plump Up Tissues And Tone Down Lines. Each 1 Fl. Oz. Bottle Of Hyaluronic Acid Serum Is Certified Cruelty-Free.