I would recommend instead going for a whey protein isolate. It's a better form of protein with less fillers such as ash, ect. that whey concentrate has. The GNC "guru's"
probably recommended soy because you are a woman.
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i think the only reason why they said to use soy is because it's been linked to raising estrogen levels...someone correct me if im wrong on this.
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I haven't heard of that I don't think. I'm pretty sure that soy is linked to lowering test levels in men.