![]() “When exposed to these factors, it becomes oxidized to dehydroascorbic acid, which is less stable and less efficacious,” Dr. In topical skin-care products, vitamin C is sensitive to light and air. ![]() Make sure to store your vitamin C products correctly. Experts generally advise using vitamin C products in the morning and retinoids at night. Lamb says, but it’s okay to use them on the same day at different times. Using them in the same part of your routine can cause irritation, Dr. And because they can have similar effects on the skin, experts do still advise against using these two ingredients together, Dr. They work best in different skin environments, so using them at the same time may make both less effective. In the past it was thought that you should avoid using vitamin C products with retinoids at all costs. ![]() You can use vitamin C with retinol, but be cautious. Try using vitamin C in the morning and benzoyl peroxide in the evenings, or use them on different days. ![]() ![]() You can still use your benzoyl peroxide products, just not in the same part of your routine as the vitamin C. The one ingredient you should steer clear of when using vitamin C is benzoyl peroxide, which can oxidize the vitamin C and, therefore, make it less potent, Dr. ![]()
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