Look for one of the following forms of Hyaluronic Acid on the ingredient label: Pure Hyaluronic Acid/Hyaluronic Acid, Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate or cross-linked Hyaluronic Acid (Sodium Hyaluronate Crosspolymer). Seek formulas with complementary ingredients, like an emollient to help lock in moisture.