What exactly is "Nuflow Complex" on the ingredient list?

Nu-FLOW® offers producers an option to replace synthetics or other anti-caking agents including SiO2, tri-calcium phosphate, or talc with a natural or certified organic ingredient. Using 'rice hulls’ gives a clean, consumer-friendly product while also solving anti-caking, flow and other manufacturing and/or production challenges. The unique functionality comes from the causes that rice plant to take up silica from the soil and concentrate it in the hulls of the rice. Thereby producing a natural alternative to silicon dioxide or other anti-caking/flow agents.