A slower-fermenting fiber that resists upper digestion and reaches the colon intact.
Potato Resistant Starch behaves more like fiber than starch once it reaches the digestive tract — it resists breakdown in the small intestine and arrives in the colon largely unchanged.
Once there, it's fermented by gut bacteria into short-chain fatty acids, similar to inulin but on a different timeline, which is likely why the two are paired rather than one alone.
At 100mg, it's the second-largest ingredient by disclosed weight, behind the chicory root inulin.