Before they were banned older products such as 4-Androstenediol and 1-Test were some of the most popular prohormones ever! These now banned products gave great gains in size and strength along with supporting healthy sexual function. Now, AMS has introduced a new legal formulation of a prohormone that will achieve similar results as the older products. Considered a wet prohormone, 4-AD will give you some serious mass gains when stacked with our other new legal product 1-Androsterone. Used alone, it will still give you solid, steady gains that you will be able to keep for years. The original older products were effective prohormones to testosterone. Our new formulation 4-AD, is naturally found in several tissues of the body. 4-AD is converted to testosterone via the naturally occurring enzyme 3beta-HSD. 4-AD converts to testosterone at a significantly higher rate than other previously available prohormones (such as androstenedione), and like the now banned older products also does not have the weakness of conversion to estrogen and/or DHT prior to conversion to testosterone. These factors made the older products some of the best testosterone prohormones on the market at their time. Like our other new product 1-Androsterone, 4-AD also converts at a high rate to testosterone. We have licensed these advanced delivery system legal formulations for utilizing your naturally occurring hormones to provide one of the most advanced systems on the market today for blocking negative side effects while increasing free testosterone! Again, like the older products 4-AD does not directly convert to estrogen or DHT, and you can use the product the same as you used the older products such as 4-Androstenediol and 1-Test. 4-AD is also more androgenic, meaning it has more male characteristic enhancing properties. This is of course, something all males desire. When stacked with 1-Androsterone, you can expect extraordinary mass and strength gains while experiencing supported sexual function and the energy to power through the most grueling workouts.