Diatomaceous Earth : Safe for internal use by humans?

Hi Everyone,

Someone referred to this link, that indicates how Dr. Clark felt about Diatomaceous Earth (DE) for the internal use by humans. It seems she had concern that DE contains heavy metals and Aluminum. The link seem to be not accessible anymore.

Could someone provide an updated link or any other article that indicates Dr. Clark's or some other Naturopath's concern about DE?

Old link:
Dr. Clarke; Online Store; Health Articles. Health Enhancing Aids; Skin Care; Superfood ... DIATOMACEOUS EARTH - GOOD FOR MAN OR BEAST. How did Diatomaceous Earth come about?

Another link (this too expired):

http://www.clearwaterherbs.com/Vitamins-and-Minerals/Diatomaceous-Earth-controlling-worms-and...

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