Dissolve dead skin cells with PHA & Hydrate with Hyaluronic Acids While PHA, the mildest exfoliating ingredient, dissolves dead skin cells and clears out congestion, natural cellulose works in harmony to eliminate impurities softened by PHA. At the same time, three kinds of hyaluronic acid and 2 kinds of naturally derived flower extracts draw in and hold moisture to hydrate and soothe, which leaves behind brighter, smoother skin with a dewy glow.