I just read this whole thread, and what I have seen;
1. There is no conclusive proof that DE has any benifits to hair, nails, or much else that people claim
2. Most (if not all) of the 'evidence' given is not scientifically valid
3. It is known to kill microbes and some parasites, good, bad, or indifferent, it does not have a way to discriminate
4. It is non digestible so a very large percent of it just passes through your system
What I think;
1. This is little more than another mostly benign substance that does little good or harm in most cases
2. Without before and after tests the statements made mean nothing
3. People are always looking for a miracle, this leads to things like MMS, (Miracle Mineral Solution), which is little more than industrial strength chlorine, and god-awful concoctions of things like slippery elm bark and fever flu as a sure fire cancer cure.
If you think it works for you then fine, it probably does, a little.