Can I use Retin-A and vitamin C at the same time?

Retin A and Vitamin C both are great anti aging skin care products. However, both can be irritating, so it is best to do the Vitamin C in AM and Retin A in the PM

You should use the Vitamin C during the day  accompanied with SPF 35 or higher with at east 7% zinc in it, alternating nights with Retin- A. For example: Monday morning you decide to use the Vitamin C in your skin regimen, use the Retin- A Tuesday night; and so on.  

Using both is a great idea and it will produce beautiful results, as long as you apply them correctly at the time of day that allows them to be at each products best. Good luck to you. 

Retin A may be used in conjunction with a topical vitamin C product. However, the topical vitamin C product should be applied at least 30 minutes before or after the Retin A. Also, the vitamin C product when used in combination with Retin A may cause irritation and thus would suggest this protocol only after a dermatologist reviews with you. The topical vitamin C product should be approved first by your dermatologist as well since there are so many "gimmicky" products out there.