Gosh, I'm sorry but I get so overloaded w/ info. when reading that it's hard to figure out what is best! Last question (for today) is if anyone uses vitamin C at night w/their retin a? I'm just thinking that I can't wait 20 minutes in the morning to wait for my vitamin c to sink in and before I do my makeup--no time! should I do it at night instead? I buffer my retin a and am confused if I should mix the serum w/ retin A or put it on then wait 20 minutes to put on retin a. I'm just afraid of cancelling out the effects of these products! BLAH!