Paula's Choice Skincare makes products that work. No fragrance, no parabens, no fluff. Just effective, science-backed formulas that target any concern from wrinkles to breakouts. Paula's Choice products are made with YOUR SKIN in mind. Whatever your skincare concern, whether dryness, acne, fine lines, or sensitive skin; we've got a treatment line for you. The search for amazing skin care ends here. Finally, you found it. Use this booster alone or add a couple drops to a moisturizer twice daily as part of your morning & evening skin care. Use along with your favorite Paula's Choice cleanser, toner, exfoliator, spot treatments & moisturizer with SPF for daytime wear. Paula's Choice 10% Azelaic Acid Booster also contains salicylic acid (BHA) a gentle exfoliator. The multi-tasking formula boasts a lightweight, oil-free texture that works beautifully on its own or mixed with other acne treatments, like benzoyl peroxide. CLARIFY SKIN, SOOTHE IRRITATION: This highly effective serum booster is a multi-action powerhouse, featuring Azelaic Acid, known to reduce the look of blemishes and acne, while also helping to fade brown spots and marks from previous acne breakouts.