Azelaic Acid is a 3-in-1 clinically proven active that helps reduce blemishes, pigmentation and redness. This formula uses a new-generation water-soluble form called Potassium Azeloyl Diglycinate (PAD) that has similar properties to Azelaic Acid, but enables a super-light, oil-free texture. The two strong points of PAD are to even the skin tone and to control excessive oiliness. Based on our experience, those who are sensitive to niacinamide tend to find aPAD an especially helpful addition to their skincare routine.