The Soluble Silicon content in DE is 21.67PPM and accounts for .002761 % of it's composition. That's all I've been able to find, and I'm not sure how to work that out to g/mg.
Source: http://www.internet-grocer.net/diatome.htm
Also see spiffy chart giving detailed break down of mineral content in DE: http://www.internet-grocer.net/de-1.jpg
(I don't want to imbed the image because I don't want to nick their bandwidth and also don't wish to submit people who aren't interested in minutia to info overload.)
It is important to keep in mind that there are several kinds of silica. The type of silica found in Food Grade DE is Amorphous Silica. DE has been found in human studies to lower blood cholesterol levels. (Studies performed by Institute of Medical Chemistry and Biochemistry, University of Innsbruck, Austria. Source: http://www.diatomitecanada.com/the-s...eous-earth.htm )
At any rate, you're certainly not raining on my parade Thanks for the heads up, and I certainly appreciate your concerns. At my current dosage of around 1 TBSP/day I don't feel that I'm in danger of exceeding the safely recommended doses. I will continue to take DE as I have experienced several health benefits from it including more restful sleep, (I used to wake up several times throughout the night for no real reason,) a marked decrease in joint pain from my Rheumatoid Arthritis, improved digestion, and a general decrease in the severity of my allergies. (Now if only it could prevent me from catching cold...)
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