I have used diatomaceous earth for years. I have known many people who ingest it also. I use it as a pesticide and dewormer for my alpacas. It not only gets rid of the flies, but also acts as a dewormer saving me thousands on medication and labor. It is not recommended to have children in close proximity while dusting. Since adults ingest it. I think the warning is more geared towards children and those with sensitive lungs.