POWERBRIGHT DARK SPOT SERUM 1.0OZ. Benefits: Advanced treatment serum is formulated with light-diffusing technology that begins to balance the appearance of uneven pigmentation within days. Suggested for those concerned with uneven skin tone and texture, hyperpigmentation, aging skin, and sun damage. Key Ingredients: Hexylresorcinol & Niacinamide: help quickly fade dark spots. Shiitake Mushroom: rich in antioxidants, brightens skin. Light-Diffusing Technology: balances the appearance of uneven pigmentation after one use, and continues working over-time. Research Results: Starts fading dark spots in a week, and continues to diminish them over time. 1 week - starts fading dark spots. 4 weeks - begins reducing dark spots' size. 8 weeks - reduced the number of dark spots.