Cos de baha azelaic acid 10% serum 30ml (az), it's 10% powder solution ingredients. 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. Our 10% azelaic acid booster also contains niacinamide a gentle acne treatment. The multi-tasking formula boasts a lightweight, oil-free texture that works beautifully on its own or mixed with other skin treatments.