It might be worth pointing out that the potential danger is not in taking silica or horsetail, but in taking it through the form of DE. (Someone please correct me if I'm wrong!).
There are many silica and horsetail supplements out there, and many people take will no ill effects (assuming they follow directions and not take too much).
I've used KAL Super Silica Plus (vitaminshoppe.com) for years, and have no problems. I think (and again, coorect me if I'm wrong) that such a supplement is one way to benefit from silica/horsetail without the dangers that come from DE.
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