Patients 5-13 years female and male, signature of consent include prior informed consent more by their legal representatives and themselves. To meet the exclusion criteria will carry out a clinical and laboratory analysis established to assess primary and secondary immunodeficiencies, physical examination and radiography of paranasal sinuses to rule out chronic nasal pollinosis will be made, if not respond well to treatment ask tomography sinus, are excluded if they are in the service plan surgical ENT, they must be virgin of any treatment with vitamin D and have not received in the last 5 years immunotherapy for allergic diseases. They will be randomized and in the same proportion, obtained by random numbers in Excel. 3 clinical assessments and sampling for laboratory studies, baseline, another at 3 months and the last 6 months in the 2 groups will be made. clinical parameters were assessed with validated questionnaire RQLQ samples for BH, IgE, IgG, total IgA, nasal cytology were taken, skin tests with allergens based on the standards of the American Association of Alergia26 be made, serum vitamin levels are measured D. concentrations of IL-2, IL-4, IL-6, IL-10, IL-17A, IFN-γ and TNF (BD CBA Human Th1 / Th2 / Th17 Kits) shall be gauged; percentages and absolute numbers of Treg cells (CD4 + CD25 + FoxP3 +) and Th17 (CD3 + CD4 + CD161 + CD196 + (CCR6 +)). After processing the blood samples and obtain cells in the laboratory according to the suppliers recomendciones be marked with the following fluorescent antibody: