Phytase breaks down phytic acid (phytate) found in grains, legumes, nuts, and seeds. Phytate grabs onto minerals like iron, zinc, and calcium and keeps your body from absorbing them. Taking phytase with a meal releases these trapped minerals, which can improve their absorption.
Some people also find it eases digestive discomfort. Take it as a capsule or tablet just before or with meals that contain plant foods. Most people tolerate it well.