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Thus, other routes of administration for allergen-specific immunotherapy such as topical, sublingual and intranasal have been explored in the research and industrial fields. Nevertheless, it has been observed that few studies are using these alternative administration routes, probably due to the higher cost and lack of investments. The delivery systems are also other tools that can be more explored in the allergen immunotherapy formulations. The effectiveness, safety and acceptance of this therapy depends on the development of new formulations and routes of