ALK-Abello A/S engages in the production and development of pharmaceutical products to prevent and treat allergies. The firm manufactures tablet-based allergy vaccines for pollen, house dust mites, animals, and insect stings. Its treatment comprises allergy vaccines, emergency treatment, and allergy diagnostics. The company was founded by Poul Christian Krejner Tejn Barfod on June 9, 1923 and is headquartered in Horsholm, Denmark.