Ditto what Kchaystack said- your mileage may vary, but for what it's worth, I've been using it in my HP shave soap for over a year without any DOS issues. And a few months ago used it @ 30% in a batch of Genny's famous shampoo-bar recipe.... which doubles as an awesome body bar, btw. So far, it's holding up great, but I'll definitely be keeping an eye on it as the months progress.
IrishLass
IrishLass