Even if they're already approved for human consumption, the end production process needs to occur in a cGMP approved facility to cover themselves legally.
What you're talking about is commonly referred to as a "certified kitchen".
Not only is this process simple, but there are community available certified kitchens in most major cities that people like the aforementioned hippies use to make their granola bars.
Do you really think that they will start some approval process? I think they will licence this stuff to some company that already has such approval. Other way they can probably order ready mix based on their recipe in some company. I don't think they will mix it by hand in kitchen.
