I can't access their site to see what's in it, but from other sites that carry it, it appears
that the main ingredient is benfotiamine, which can be gotten by itself for a fraction of the cost. I suspect
it's like many other products formulated for PN -- a mixture of a few that are already known to be of some benefit, packaged and marked up. Buying the components individually is not only less expensive, but you can tweak the mixture for your own body's needs.
Benfotiamine has been discussed here quite a bit; try the archives (Search facility).