The original, Animal Stak was launched over nine years ago, and though the formula was cutting-edge at the time, anabolic supplements utilizing natural hormone boosters were still in their infancy. Almost ten years later, many new compounds have come onto the scene, raising the bar as we've always strived to do at Animal...Enter the all-new & improved Animal Stak. Building on the legacy built by the original and popular Animal Stak formula, this new and improved version has taken the most powerful components of its predecessor, combined it with newer nutrients and cranked it up to the next level. Animal Stak has long been built on being a complete anabolic hormone stack. It's not just a testosterone booster. It's also a GH booster.* Stak also contains specialized hormone amplifiers and ingredients to optimize ones internal anabolic environment. It is extreme and all-encompassing, just like every pack in the Animal line.
 
With Animal Stak you get a mega-potent dose of 1500mg of testosterone boosters. The Pro Testosterone Complex found in Animal Stak includes a variety of ingredients that help to elevate both of your testosterone levels: free and total. Testosterone is the primary hormone that interacts with skeletal muscle tissue and as many know, testosterone's role is paramount in muscular development. When it comes to optimizing testosterone levels, there's a couple of things to take into consideration. You want to make sure your testosterone levels aren't low - nutritional deficiencies can cause low serum testosterone levels. You also want to make sure that your ratios of "free" testosterone to "total" testosterone are advantageous. Free testosterone is the form of testosterone that exerts the anabolic effects strength athletes are after; it's the stuff that gives you results. By addressing all these issues, you could tap into your body's true potential.* Stak gives you one and a half grams daily of natural test support in every pack. That's serious.