Test Stack No.17 is not a drug, but it acts like one. The difference is, it does not cause any suppression. Once you stop, your testosterone and libido will return to where it was before you started. And you can stay on as long as you want! It’s like taking a daily vitamin, but it does so much more! Nor does it give the nasty side effects of Viagra – headache, stuffy nose, feeling flush, anxious or blurry vision. It’s all natural and perfectly safe, yet every bit as effective.