A must-read guide to the latest nonprescription supplements for peak sexual and athletic performance and optimal health.

Testosterone is "the super hormone"; no other natural substance comes close to its power to energize, rejuvenate, and sexually arouse both men and women. Under new federal regulations, consumers have access to a whole new group of supplements that boost the body's natural testosterone levels. Available without a prescription, these "T boosters," including androstenedione, promise to revolutionize health, fitness, and weight management regimens for men and women. In many...