What It Is:A brightening face serum with a potent form of Vitamin C and Salicylic Acid to help reduce the look of dark spots, hyperpigmentation & post-acne marks, A powerful dark spot corrector and brightening face serum., This lightweight brightening face serum is formulated with a potent form of Vitamin C, Salicylic Acid, and Peony Extract to help visibly reduce hyperpigmentation, dark spots, and post-acne marks.Key Ingredients:- Activated C is a stabilized form of Vitamin C that specifically addresses uneven skin tone and hyperpigmentation, goes to work immediately upon contact with the skin. Within Kiehl's Since 1851's formula, Activated C helps visibly diminish the look of dullness and uneven skin tone and helps increase clarity and brightness for a healthy-looking, more radiant complexion.- Buffered Salicylic Acid: Targeting skin's surface, it works together with Activated C to visibly reduce discoloration and renew the look of skin's texture.- Peony Extract: Used in traditional Chinese medicine, Peony Extract is a natural antioxidant that helps protect against oxidative damage. In Kiehl's Since 1851's formulas, it works with Activated C to enhance skin clarity.How To Use It:Use this brightening serum morning and night during your skincare routine after cleansing and before your moisturizer. Apply serum over entire face or use as a spot treatment. For optimal results, apply a daily sunscreen.