Retin -A

What do you ahve to say about Retin A. Someone I know got great results from it - Acne is gone completely an he is not even using it anymore. He has been off it for over four months now.

This external application coupled with internal cleasnes could simultaneoualy wok the inside and outside. What is the downside?I have been using it for a week now and my skin is deinitely visibly better. there was a lot of peeling the first four days and now its still peeling and bringing out nicer skin but it looks sooo much better than it did last week.