NEP which we call from Natural Enzyme Phytogrowth, plus A is for Asphalt Concrete, is formulated by blending high quality tar oils (ordinary to say bitumen) as a rejuvenating agents or recycling agents. Ensure that the product conforms to very stringent specifications and every manufactured batch of NEP plus-A is rigorously examined by independent testing facilities. NEP plus-A directly hot and warm mixing with aged recycling asphalt concrete and new bitumen materials, then rejuvenate original aged bitumen to younger age and restoring ductility and viscosity to near original values.