I highly encourage you to look more into what you are eating rather than a pill. No matter how safe the pill is, it is messing with your natural body chemistry...and it is not teaching you how to understand and control your weight gain.
I have been doing a program called the 6 week body makeover and I highly recommend it. People lose tons of weight on it, but it also helps you to understand how your body works. You should have absolutely NO problem losing 15 pounds in 6 weeks (I lost 30 pounds in 8 weeks and I didn't do HALF the exercise you are doing!--I am now smaller than I have been my entire adult life and still losing)...and I guarantee if you follow the program you will lose at least 5 pounds in the first week alone....I lost 10, but I had a lot more to lose...
What I like about this program is it is not a gimmick--and I wouldn't call it a "diet" either, but rather a healthy eating program. You don't take a magic pill and lose the weight. It is eating healthy and exercising--exactly what you are doing...except you are not eating for YOUR specific body type. This program teaches you what your specific body type reacts to and then you know what to avoid to keep those pounds gone (btw...I eat potatoes 3 times a day...and average 1/2 pound weight loss every day). They also tell you the exercises you need to do to tone up the areas that you want to tone up. I like to equate it to a personal trainer, but much cheaper.
For the cost of what you would spend on one jar of "good" pills, you can learn how to manage your weight and eat healthy (and teach your kids how to eat healthy) for the rest of your life. Just look it up and see: www.bodymakeover.com