Why? Polymerized ragweed is safe and effective.
D002986:Clinical Trials as Topic; D006801:Humans; D007167:Immunotherapy; D011058:Pollen; D011108:Polymers; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy; D014481:United States; D014486:United States Food and Drug Administration
D011108:Polymers