La Roche-Posay Niacinamide 10 Anti-aging Concentrated Serum clarifies skin discoloration and rebalances the look of uneven skin tone with visible results starting in one week. This formula with 10% Niacinamide visibly reduces discoloration post-acne marks (also called post-inflammatory hyperpigmentation) and even stubborn dark spots to reveal a brighter more even complexion.