I used neem with boswellia (frankincense), oil of oregano (enteric coated from NOW) and myrrh.
This was the formula that killed roundworm after trying numerous other products.
I have been on this board for a long time and cannot tell you when I saw conclusive proof of DE, Hulda Clark products, Black-Walnut etc ever working.
The problem is that very few (I underline very) ever come back to report their results which leaves others in the dark. In fact most people (80%) will never respond to their original post.