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Images: Canva
According to Dr Aanchal, Dermatologist, Vitamin C is an unstable molecule. So you have to be careful about what you are mixing with vitamin C.
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Alpha hydroxy acids: Do not mix a glycolic acid or lactic acid with vitamin C. Instead, use vitamin C in the morning and there AHA 2-3 times at night.
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Alpha hydroxy acids: Beta hydroxy acids Do not use salicylic acid with vitamin C. Instead use salicylic acid as a spot treatment on areas of acne and blackheads or whiteheads.
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If you have active acne, it is best to avoid vitamin C altogether and use azelaic acid instead.
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Retinol Mixing vitamin C and retinol together is not a good idea. It may cause dryness and irritation. Instead use vitamin c in the morning and retinol at night to reap full benefits of both ingredients.
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Benzoyl peroxide Do not combine benzoyl peroxide or other acne medications with vitamin C. Benzoyl peroxide can use redness and irritation to the skin.