First sentence of the second paragraph is a confusing run-on sentence. I'd suggest breaking it up. If the idea here is to convey how simple the underlying idea of the product is, the sentence(s) explaing it shouldn't be confusing.
LAst sentence, third paragraph: Distracting english to start a sentence with "because." Many of us speak that way but the sentence would be stronger if you struck the "because." Then it would be a strong declaration "What good are anabolic ingredients if they are under dosed."
Speaking of "under dosed," there should be a "-" between the words.
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Second sentence, 4th paragraph: Too many "ands." The "and" before "superior growth" should be replaced with a comma. You don't want a sentence that has two "ands" in a row in it.
Other than that, I like the overall look and style. I'm not sure how the model will add or detract from it. Feel free to send me some of her test shots.