I have one from Sephora and yes, it does work! You can feel it tinglying and your lips almost itch for a second or two, and you can tell it's working... no, they don't make you look like you've had a lip injection or anything, but they do give you a little extra something!

Just be careful and make sure that you're not allergic to the stuff. Test some out on your hand first and see if it starts to get red and white and irritated.... one of my friends put a lip plumper gloss on her lips and had to go to the emergency room for an epipen 'cause she was so allergic!