|Yes, I can attest they really do work. They are very hard to find but if you can stock up! If you take them religiously like they say you will be immune for over a year and maybe longer.
I've been taking them since I was a child and though I am very reactive to PI, I can rub the leaves right on me after building up the immunity using these pills.
Yes, they work! Don't be affraid that they contain PI--that's the point of the pill. It's way to low a dose to do anything.