I don't think it's toxic to consume orally. Silica is a harmless mineral. I kinda doubt the claims that that DE gets rid of intestinal parasites though. It kills bugs outside the body only when it's dry because it has sharp little points that stab the bugs' joints. But, when it's wet, it softens & doesn't kill bugs outside. So, I would think while it's inside the body and wet, it would be soft an unable to kill bugs inside the body.