I have been using Tretinoin, which is a Vitamin A product available by prescription, for my wrinkles for about a month now. It is harsh on my skin, but it seems to be working. I think that it has lessened the deep creases on my forehead. I intend to keep using it faithfully as directed (once a day at bedtime) - but I am curious and anxious for some first-hand feedback. Has anyone here used this product? If so, how much benefit should I expect from it, and how long will it take? And do you have to keep using it to maintain the results? Thanks.