IRCT20160813029327N14 IRCT 2018-07-17 Islamic Azad University Assessment of Vitamin D Effectiveness on Asthma Treatment Assessment of Vitamin D Injection Dose Adjustment on Vitamin D Deficient Asthmatic Patients Improvement and Treatment 2017-10-17 anticipated 20 Complete https://irct.ir/trial/29978 interventional Randomization: Not randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment. 3 Asthma. Intervention group: It includes asthmatic patients with 25(OH)D3 baseline under 20 ng/ml (Vitamin D deficiency). So They need to take blood test in order to evaluate 25(OH)D3 baseline first. After they are diagnosed with Vitamin D deficiency, Vitamin D Ampoule 300,000 IU is injected to them intramuscularly(IM) once in the first month of the study and the second Vitamin D Ampoule injection, one month after the first injection, is taken again IM. Furthermore, their respiratory condition should be checked by the spirometry test and St. George's respiratory questionnaire once in the first step of the study and Then again, two months later. Moreover, another blood test two month after the first injection should be taken to see if their 25(OH)D3 baseline is corrected. Finally the results of Blood test, Spirometry test and St. George's respiratory questionnaire which were collected in the first step of the study will be compared with the ones collected after two months of follow up to see if this type of intervention is beneficial for the patients.. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information.