goop 20% Vitamin C + Hyaluronic Acid Glow Serum illuminates and hydrates skin. This powerful serum combines 20% L-ascorbic acid, the purest form of Vitamin C, with moisturizing hyaluronic acid. Its innovative two-part design ensures maximum potency and freshness. The serum brightens skin's appearance, improving firmness, tone, texture, and hydration for a radiant, luminous, and healthy look.