Personally I would use Animal Test. Do a search there are alot of threads out there about Animal Stak. Here is the difference from the Animal Test FAQ:
"Animal Test FAQ #7: What's the difference between Animal Stak & Animal Test?
Animal Stak is a comprehensive natural anabolic hormone booster. Stak works by increasing the body's natural production of anabolic hormones (including test), while at the same time, decreasing the production of unwanted catabolic hormones. Animal Test contains potent extracts, which are designed to specifically facilitate a rise in free and total testosterone with effective anti-estrogen compounds capable of maximizing the natural anabolic response. Coupled with Arachidonic Acid, Test works to maximize total testosterone output and utilization."
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