Azelaic acid is a redness-relieving, acne-fighting ingredient that has mild exfoliating properties. It can actually be paired with any ingredient as long as your skin tolerates it! It can potentially be a bit drying to the skin, but it’s suitable for even sensitive skin. Whether you have rosacea, other redness, acne, or are just looking for an ingredient for healthy skin, azelaic acid is a great choice! Prescription-strength is more beneficial for things like rosacea and acne, but even the cosmetic grade 10% can still provide some relief. I use it day and night!