Years ago I recall a friend swearing by an expensive soap he purchased that had diatomaceous earth in it. Diatomaceous earth is not actually dirt or clay but 250 million year old material made of fossilized diodes(microscopic single-celled algae). The super tiny fossilized particles are reputed to be a safe and effective exfoliant, and the material is very rich in silica which is good for skin, hair and nails. Has anyone here experimented with this ingredient? If so, what were the results?