Ingesting some anti parasitic worms drugs once a year, in a safe dose, will not kill you. It is worse to chronically ingest herbs or others alternative substances which contain toxic substances...
Some plants parts are safe to ingest but some are toxic in high doses.
What others substances are in the diatomaceous earth ? i bet that most sellers don't know...
I have not found that diatomaceous earth manage to kill all kind of parasitic worms (or at least the adults) in all parts of the body, i have tried and it was really useless to kill adult parasitic worms in the digestive tube. Even with higher doses than what was recommended...
But i have to admit that it seems to help to clean the digestive tube, like with clay powder.