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.
As mentioned, seat belts promote safety. 1  More specifically, seat belts can aid in the following: 2  Preventing you from hitting the windshield. 3  Preventing you from being thrown from the vehicle. 4  Preventing you from banging around the vehicle and hitting the steering wheel, door, etc.