Phytic acid, also known as phytate, is a derivative of inositol produced by phosphorylation all 6 possible hydroxyl groups of inositol. 3-phytase and 6-phytase are phytases where phytate-3 carbon or phytate-6 carbon hydroxyl group has been phosphorylated, so the main difference between the two is the phosphorylation site. Current phytase market is dominated by 6-phytase, and Bestzyme's Phytase is 6-phytase as well.