Right now I'm using Hydroxycut Hardcore (thermogenic) to cut some weight and bump my metabolism. But I also drink a pre-workout drink, a drink for during your workout and a post-workout formula.
Pre-workout
http://www.gnc.com/product/index.jsp...593186.3984282
During Workout
http://www.gnc.com/product/index.jsp...593186.3996565
Post-Workout
http://www.gnc.com/product/index.jsp...593186.3984491
Just by taking the Hydroxycut Hardcore I dropped 5lbs in one week with only working out 3 times that week. I've bumped up the amount I workout from 3 days to 5 days and will be weighing myself at the end of the week.