@Sara Marie, could you please remove the link to the company that you posted? There was a court action lodged against this company alleging inflated claims for its particular version of this product, and I would hate anyone to click through, believe the hype, and spend a lot of money on this because of a thread that I started.
Superstarch is a legitimate product in its own right (not "just cornflour") but it appears that this company may have exaggerated its benefits to athletes for sales purposes.
Maybe I should delete my post. I just wanted to find out if it was going to cause any horrible GI distress for j-pouchers before I bought some (from a reputable source).
If you can think of a way for me to clarify this, please let me know. I'm having terrible cognitive issues at the moment and can barely string two thoughts together.