I use DE for many things, esp. with pets. I WANT to take it myself internally, but I can't get past the ideas that it's shards of shells ... how come it doesn't shred or tear the gut?
I don't want to take it and find out 10 years down the road that my guts are shredding beyond repair!
DE is an extremely fine abrasive. It is really no different than fiber, which gets its stiffness from silica. Also keep in mind that the gut creates a thin protective mucous layer. So consuming DE is not going to hurt the gut in any way. If you are still worried just allow it to saturate the water like I use it. That way all you are consuming is liquid orthosilicic acid rather than solid silica.