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: (1) you'd want to make sure your testosterone levels aren't low - nutritional deficiencies can cause low serum testosterone levels; (2) you'd want to minimize the conversion of anabolic hormones like testosterone to hormones such as estrogen and dihydrotestosterone (DHT); (3) finally, you'd 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 three issues, you could tap into your body's true potential. We engineered Animal Stak to address all three aspects of hormone management mentioned above, making it a complete natural "test" pack. Animal Stak contains ingredients to help positively impact estrogen and DHT conversion, a natural process. It also includes nutrients that can help increase serum testosterone levels.