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In honor of Hyaluronic Acid Day on January 21, we're taking a look into this widely-used skincare ingredient. What is hyaluronic acid? How can it help your skin? What are the best ways to use it? We've got the answers to all these questions and more. What is hyaluronic acid? According to the Cleveland Clinic , hyaluronic acid is "a gooey, slippery substance that your body produces naturally." It's been found in the joints, eyes, and skin. Hyaluronic acid has many functions i