INTRODUCTION: Allergic rhinitis is a common disease affecting 10 percent people. Sleep, quality of life, and productivity at work are all significantly impacted by severe allergic rhinitis. An increase in allergic diseases has been associated with a lack of vitamin D. METHODS: It is a case control study in which all patients with allergic rhinitis were included and their vitamin d levels were evaluated. Case group was given vitamin d supplementation weekly and their TNSS score was evaluated against those control group where no supplementation was given. RESULTS: A total of 80 individuals were diagnosed with Allergic Rhinitis. At the time of presentation, the average age of the people was 24.5 years. The average TNSS value before therapy for the study group that took oral vitamin D3 medicine was 11.10 ± 2.10, and after treatment it dropped to 3.2 ± 0.5. The average TNSS score before to therapy was 12.40 ± 2.50 in the control group, which utilised medicines devoid of oral vitamin D3. DISCUSSION: The link between low vitamin D levels and an increased incidence of allergic disorders has recently attracted more attention on a worldwide scale. But studies on this area have shown contradictory results. The purpose of this study was to determine whether or not supplementing with vitamin D3 helped individuals suffering from allergic rhinitis. CONCLUSION: Vitamin D3 significantly improves the clinical manifestations of allergic rhinitis when administered. Noticeable clinical benefits are achieved when the therapy method for allergic rhinitis is changed by injecting vitamin D3.