What it is: A powerful dark spot fighting serum that immediately boosts radiance and hydrates for 48 hours. What it does: The formula features triple-active power. Inspired by professional treatments, this vitamin C powered serum rapidly ignites skin's radiance and targets multiple types of dark spots to reveal a more even-toned look. A powerful triple-ferment combines a high concentration of the brand's exclusive yeast ferment with a spot targeting molasses ferment, plus a proprietary algae ferment with powerful soothing activity. All three ferments work to help reduce the appearance of dark spots and enhance clarity and calm for glowing skin. The Estée Lauder ferment complex is 98% naturally derived. The vitamin C in the formula is a renowned radiance-boosting, anti-aging and skin-boosting active. In the serum, it targets dark spots in the deepest layer of skin's surface to help reduce the look of skin discolorations. With its anti-oxidant properties, it helps prevent the appearance of new spots and skin discolorations. The formula goes on lightweight and feels fresh. It's ultra-hydrating, fast-absorbing and helps smooth skin's texture and enhance the natural radiance of your glowing skin