How about (food grade) diatomaceous earth? It is supposed to be really effective against all bugs, but perfectly safe for humans.
I just ordered some to try on my cat, since he has developed a case of mites. A lot of my friends swear by it. They use it for all kinds of 6-legged pests.
Supposedly, you can even take it orally as a parasite killer.
From what I have read, the only harm it can cause is to dry out your skin if you get a lot of exposure.