If you want to know whether vitamin C and azelaic acid can be applied together, you must study the properties of the two in detail. Vitamin C has strong reducing properties, is beneficial to the skin, can help whiten, resist oxygen, and can promote collagen production, making the skin smooth. Azelaic acid can inhibit Propionibacterium acne, reduce skin oil secretion, and also have the effect of whitening light spots. It is often used to treat acne, pigmentation and other diseases.

If the two are applied together, be careful. The acidity of vitamin C meets the nature of azelaic acid, or a chemical reaction occurs, causing its effect to change. And both are irritating to the skin, and the same use may increase skin discomfort, such as redness, tingling, itching, etc.

However, there are also studies showing that if used properly, there may be synergistic effects. If the low concentration is applied first, wait for the skin to adapt, and then add the concentration; or use it in time, use vitamin C for antioxidant during the day, and azelaic acid at night to treat diseases.

In short, if you want to use vitamin C and azelaic acid together, you should first consult a doctor, and according to your own skin condition, determine the method of combining them, so as to ensure skin safety and obtain the benefits of both.