RA is supposed to increase cellular division and absorbtion (kind of does a chemical peal that allows new cells and betting absorbtion.
If you are using test, you might want to consider a formula that contains azelaic acid as well as RA.
I moved up to their 15%. It is not offered with RA. For years I have used their xandrox day and night. For me, it is a lot less harsh then the generic minox you can buy at place like target. That stuff causing small blister on my scalp. I think it is the BV (Betamethasone Valerate) in xandrox that helps me.
I have been using their 15% formula for about a month. So far I really like it.
There was some crystalization of the formula. I need to find out from Dr. Lee how to force that back into the solution. I think heating it slightly and shaking might work but I do not want to ruin it.