Moisturizing gel serum to complement your skincare routine Hydro Gel 48H Intense Hello Good Stuff! contains 95% natural ingredients and is enriched with aloe vera water and hyaluronic acid. Provides intense hydration for up to 48 hours and can be worn alone or under makeup. In short, the gel serum leaves the skin refreshed and redefined. How to use Apply a few drops of serum to the face, neck and décolleté after cleansing the face, gently massage and allow to absorb.