Abu Mansur Muwaffaq of Herat flourished in the 10th century, he was an influential Pharmacist and Alchemist. Abu Mansur Muwaffaq wrote The foundations of the true properties of Remedies, where he described 585 drugs. Due to water shortages in nearby regions he studied the properties of water and also described the distillation of sea-water for drinking. He traveled to Khwarezm and the Caspian and Aral Sea regions.
He strongly influenced and inspired the teachers and works of Abu Rayhan Biruni especially in his chapters on pharmacology and Alchemy.