I have used this primer for awhile now & like the results I get with it (although I started with this after not using primer at all, so have little to compare it to). When I apply it under my foundation, It allows my foundation to be applied more smoothly and to last longer than it would without any primer. On the bottle it mentions it can be worn by itself or under other makeup, however I find by itself it makes my skin too pale & shimmery for my liking. The extra hydration is appreciated though. I would however prefer a bit of a thicker consistency as it is very fluid and can get a bit messy if too much comes out at once. I see online that this product is available with added SPF but never seen that one in stores so the one I use isn't that one.