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iHerb Customer Reviews

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Powerful Stuff

Posted by HawaiianViking on September 5 2012 | Verified Purchase

Universal Nutrition, Animal Stak, Testosterone Optimizers are powerful: I've noticed a significant improvement in my workouts while I've been taking this product. It's a good alternative to dangerous and/or illegal substances, but it's not without its drawbacks: This product is expensive. For 21 Packs, it's not the best value, and you'll probably need more than just 21 Packs to reach and maintain your training goals. For me personally, this product has given me a headache, upset my stomach and has been taxing to my liver, so it's not the easiest regimen to maintain. Still, it's probably worth it, since it is that effective.

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Good for balancing/boosting test levels

Posted by iHerb Customer on July 18 2011 | Verified Purchase

Found that this is a bit expensive for what you get, 21 days of normalized/boosted testosterone, but it definitely helps. Probably need to go through 2-3 Staks to get to where you want to be. This is a sloooow process towards getting the chiseled bod you want, but arguably a lot safer than the alternatives. I'd say if you are going for hardcore muscle gaining, this is relatively mild. Combined with lots of protein and creatine, maybe some NO2 or something like Jack3d, you should expect to see good results over a few months.

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Strength & Libido Increase

Posted by iHerb Customer on December 15 2011 | Verified Purchase

Very good supplement! Pro-Increase in both Strength and Libido. Con- Bad breakout on face

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Posted by iHerb Customer on August 8 2014 | Verified Purchase

stak has made my muscles harder and helped in my recovery time

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Posted by iHerb Customer on September 12 2017 | Verified Purchase


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Still love this product

Posted by iHerb Customer on May 24 2011 | Verified Purchase

Been using this for 3 cycles now definately get more gains than any test boosters

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Posted by iHerb Customer on April 13 2011 | Verified Purchase

good market good suplements thand u iherb

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Posted by iHerb Customer on February 17 2016 | Verified Purchase

Useless Worthless Helpless

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good product

Posted by iHerb Customer on October 27 2016 | Verified Purchase

it helped my body to change

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Quick Visible Results

Posted by iHerb Customer on January 10 2018 | Verified Purchase

Tried and at least 4/5 of my trainings has got good performance. However, body conditions, mind and focus are the catalyst to make it more powerful. Worth continue buying after 1 week clearing cycle if u r aiming at sculpture ur body with additional ANIMAL STAK strength

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