Hi,
Retin A is a very potent ingredient. Therefore, I would recommend that you consult a dermatologist before applying something so strong to your skin. When using Retin A, your skin becomes more sensitive to the sun. So make sure that you generously apply a good sunscreen 15-30 minutes prior to going outside. In desi people.........use of Retin A can cause dark marks or hyperpigmentation on the skin......if you fail to use sunscreen during sun exposure.
I recently learned about a product by Philosophy, which is sold at Sephora. It's basically a jar of Retin A capsules. Supposedly you break open the capsule and then you can mix the Retin A liquid into your night cream. I have not tried it, but it seems interesting.
Most often products containing Retin A are prescription bases. So, refer to your dermatologist. Hope this helps:)