HAL Allergy BV (HAL (Haarlems Allergenen Laboratorium) Allergy) is a pharmaceutical company engaged in the manufacture and distribution of allergy therapy treatment and diagnostic products. The products line of the company includes purethal, venomenhal, depothal and sublivac. The company works with its foreign branches in collaboration with the leading research institutes to optimally combine knowledge and experience in offering more sophisticated services to its clients. HAL Allergy provides an unique pollen calendar that gives information on which allergens are active at what time of year. The company works in a group comprising of companies located in the Netherlands, Germany, Austria, Poland, Italy and Spain. HAL Allergy is headquartered in Leiden, the Netherlands.