NIB Naturium Azelaic Topical Acid 10% is UNUSED and UNOPENED. Product Description: Our azelaic acid serum contains a high concentration of a glycinated azelaic acid complex, along with niacinamide, vitamin C and coffee seed extract to help improve the appearance of skin tone, for brighter-looking skin. Formulated with an azelaic acid derivative, this helps to balance excess oil, leaving skin feeling comfortable and hydrated.