OH MY GOD!!!! i love this stuff! i just got it today and it's already working! it says bigger lips in 30 days, but it started working on me almost immediatly! i put it on before i went to the gym and by the time i was at the gym my lips were noticeably bigger! you're supposed to use it at night so that your lips can absorb it, but you can also use it during the day as a great moisurizer. it doesn't sting or anything, i LOVE it! you can buy it at sephora, but i bought mine on ebay (still full price). the price is totally worth it!