Hyaluronic acid is a substance that’s used in both cosmetics and medicine. It’s naturally present in the human body and is found primarily in joint and eye fluids. It has a remarkable ability to replenish moisture in the body, which leads to plumper, more radiant skin. Unfortunately, as the body ages, its production of hyaluronic acid begins to decline. As a result, the skin begins to sag, dry out, and lose its firmness. Applying a skincare product with hyaluronic acid for oily skin can restore radiance and pliability.