The Natural Anabolic Stack. Animal M-Stak is a solid nutritional supplement designed specifically for strength athletes, especially "hardgainers". Animal M-Stak can "mimic the effects of anabolic pharmaceuticals by helping to support protein synthesis, nitrogen retention, and while simultaneously reducing muscle wasting. Animal M-Stak does this by helping to potentiate your body's production of five anabolic hormones: (1) Testosterone; (2) Human Growth Factor (hGF); (3) Insulin-Like Growth Factor 1 (IGF-1); (4) Luteinizing Hormone (LH); and (5) Insulin. But Animal M-Stak is more than just an "anabolic primer." It can help your body block the conversion of testosterone to estrogen and DHT; support your liver; increase energy for performance; and provide key vitamins and minerals that your body needs. 7-Methoxyisoflavon; 20-Hydroxyecdysone; Ipriflavone Arginine, OKG, Triboxybol, ALC, BCAAs & More.