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A common thread among these disorders is vitamin D deficiency. While the exact relationship between vitamin D and autoimmunity remains a hot research arena, plenty of reports have suggested a strong association between vitamin D and autoimmune conditions, including systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, and Type 1 diabetes, among others. Type 1 diabetes, in particular, has been extensively studied in relation to vitamin D. Evidence suggests that vitamin D deficiency may play a role in the development of this autoimmune disease. Beyond its well\u2010known function in bone health, vitamin D acts as a key regulator of both innate and adaptive immune responses. This review sought to explore the complex interplay between vitamin D and the immune system, with a particular focus on its potential role in autoimmunity, especially Type 1 diabetes. 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