This is a website I came across when I first started IP. I think it has some useful information and may answer some of the questions you all are having. It has some of the same information we have in our packets we received from our coach but it also has some other things. I have not read it for awhile and am planning on reviewing it myself.
Here is sentence out of the supplement section on this website. The supplement they are talking about here is potassium.
Remember our dieters are required to consume 4 cups of vegetables, two green salads and a portion of whole protein per day.