Just received my PSF vitamin C serum. How much of the stuff are you supposed to use, where does it go in the RCW routine (i.e. before anything else, after moisturizer) and how much should I use? THanks!
I use two or three drops for my entire face and neck. You would normally want to use Vitamin C in the morning....after acids or dmae, if you use them, and before sunscreen or moisturizer. You'll want to give it 10-30 minutes between the acid or dmae and the Vitamin C serum. I try to wait another 10 minutes or so before adding sunscreen or mineral powder.