Q: Does M-Stak affect test levels?

A: No, although M-Stak is an anabolic "primer" it does not work directly at manipulating testosterone or hormone production--nor does it contain any hormones. Instead, Animal M-Stak works via "nutrient-partitioning" and increasing protein synthesis and nitrogen retention. Animal Stak, on the other hand, is specifically geared for manipulating testosterone and hormone levels.