Why are some of you using the OTC retinoids ( Skinceuticals 1%) instead of the prescription Renova which has 2% or 5% retionoid.  Is it just the cost factor and the need for a prescription?  I'm assuming the stronger the more effective as long as you can tolerate it!

I also saw a statement on a website that states that Renova should only be used for 48 months??   I wonder if there is any truth to that because in the book she indicates that the longer you use it the better