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.
I do not have a belt-drive system so I am not sure how it works but I used this product to lube the hinges and wheels on my door and it works to keep the noise down. I also use it on the pulley that the chain runs on.