A high-performance brightening serum formulated to visibly reduce dark spots, even skin tone and deeply hydrate. Suitable for all skin types, the HQ5 Hydronomics Complex Serum delivers advanced active ingredients — including 5% hydroquinone (HQ), vitamin C, kojic acid, salicylic acid, alpha arbutin and hyaluronic acid — for smoother, clearer, more radiant skin.