Tribulus terrestris is the #1 selling testosterone booster, and the best example of a supplement that increases libido, but has no effect on testosterone.
Ab belts may cause muscle contractions if used properly. But the belt alone cannot produce six-pack abs. The real challenge to ab definition is the layer of fat that lies right under the skin, hiding muscle tone.
So, if you just used the Ab Circle Pro for 3 minutes a day (as they say to should) and did not eat less and do aerobic exercise, you WILL NOT lose weight like they hint you will. They say that the Ab Circle Pro gets you to your aerobic target heart rate zone faster than any aerobic machine in the gym.