I have very sensitive skin so I am always cautious when trying new products. I was so pleasantly surprised by MD Factor. Now I regularly use MD Factor as a primer under make-up. It fills my large pores and makes my skin smooth. At the same time, it works as a concealer covering my red areas. When in a rush, I don't have to apply my make-up as it also works great as a foundation. Flawless Factor and some blush and I are out the door.