Vitamin B12 and Vitamin D deficiency may contribute to recurrent aphthous stomatitis (RAS). Current studies have showed vitamin B12 to be associated with vitamin D in women, however no study has assessed vitamin B12 associated with vitamin D/25(OH)D in women with RAS. Objective: To investigate the association between serum vitamin B12 and vitamin D/25(OH)D in women with RAS. Materials and Methods: Fourty one women with RAS who meet the inclusion criteria participated in this study. The

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... study. The inclusion criteria were women with RAS without other oral diseases. The exclusions criteria were those who have systemic diseases, taking medications or smoked. All subjects underwent venupuncture to draw blood to quantify serum vitamin B12 and vitamin D/25(OH)D. The characteristic of subjects, severity of RAS, serum Vitamin B12 and Vitamin D/25(OH)D were collected and presented descriptively. The correlation between vitamin B12 and Vitamin D/25(OH)D was analyzed using Pearson correlation test with 95% confidence interval. This study was approved by Medical and Health Ethics Committe, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia. Results: All RAS subjects have normal mean value of serum Vitamin B12 (453.97+154.44pg/ml) and have low mean value of serum vitamin D/25(OH)D (10.79 +3.29ng/ml) categorized as vitamin D deficiency. The Pearson correlation test showed that there was a significant positive correlation between mean serum Vitamin B12 and Vitamin D/25(OH)D (r= 0.313, p<0.05). Conclusion: There is correlation between vitamin B12 and Vitamin D, and a low level of Vitamin D may contribute in RAS in women.