Has anyone used protienex?

I am still pre op but my date is coming soon. I got a sample of orange flavor protienex in the mail. It is fat, carb, and sugar free. Is this a good suppliment for the beginning or should I be trying to get all my protien from food?

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.