He lists all the ingredients on his blog, and talks about why he chose each one. He also discusses effects he felt when experimenting with the proportion/amount of certain nutrients. There's no "magic" in this at all.

http://robrhinehart.com/?p=424

Thats the link for the ingredients. Blog posts around there discuss some modifications that were made here and there.

As for production, I think many things like this can be replicated. However, I'd love to just buy this, or at least a "base version" rather than sourcing all the various nutrients and powders, then measuring/mixing them, etc.