If you’re worried about mixing niacinamide and azelaic acid in your routine, you’re in the right place. You can use azelaic acid and niacinamide together to reduce the size of pores, eliminate redness, and help control oil. Skincare brands sell niacinamide mixed with azelaic acid, so you don’t have to mix them yourself. If you want to use them separately, apply the product with the lightest texture first.