Visibly smoother, brighter skin in 1 week, and fades the look of dark spots in 4 weeks. Each Neutrogena Rapid Tone Repair 20% Vitamin C Serum capsule contains 20% concentrated Vitamin C to reduce the look of dark spots and early signs of skin aging. It’s clinically proven over time to help reduce the look of dark spots for a more even complexion and smooth skin texture, and to minimize the appearance of fine lines and wrinkles. Formulated with 20% pure Vitamin C to visibly reduce the look of dark spots and early signs of skin aging for beautifully luminous and even-toned skin.