What are the ingredients used in an allergy shot?

Allergen Extracts. Allergy shots contain extracts of common inhalant substances (dust mite, cat, dog, mold, pollen, etc) that are called allergens. The extract should be prepared under the direct supervision of a board-ceritifed allergist who has specialized training in allergy & immunology. Allergy shots do not contain serum.
Allergens. Allergy shots contain the "allergens" or allergic proteins which have been determined to be causing the allergy symptoms. This includes proteins from dust mites, molds, cats, dogs, cockroaches, feathers, pollens, etc. They are mixed in a saline solution with other stabilizers to help keep these proteins stable during the treatment.