Regular starch gets broken down almost immediately. This one is bred to resist that — it survives the small intestine and arrives at the large intestine still whole.
That's the entire point: it becomes fuel for gut bacteria in the same way konjac glucomannan and baobab fiber do, just from a different plant source.
Peas were chosen specifically because their starch has a well-studied resistant fraction, which is why it shows up in fiber-forward formulas like this one.
In the BrainLive formula: Resistant Pea Starch is one of five named actives — see the full mechanism on how BrainLive works.