Where to buy high amylose corn resistant starch?

Regular cornstarch is not high in amylose. High amylose corn resistant starch is a specialty product and is not generally available in grocery stores at this time. Hi-maize resistant starch, made by National Starch Food Innovation, is the most commonly available high amylose corn resistant starch because it has been widely investigated in published studies for its health benefits. It may be available on Amazon.