Introduction and objective:
Sun-derived Vitamin D is vital for diverse physiological functions. Nevertheless, vitamin D deficiency is common and can have serious consequences for mental health. Ongoing research explores the connections between vitamin D deficiency and depression and anxiety disorders, its role in their development and potential therapeutic uses. The aim of the study is to investigate the role of vitamin D in depression and anxiety disorders, and review clinical studies on its potential therapeutic use in treating these conditions.

Brief description of the state of knowledge:
The review concludes that vitamin D may influence the occurrence and course of depression and anxiety disorders in various ways, and may find application in their treatment. As evidence of this, several clinical studies have confirmed both the association of vitamin D with symptoms of depression and anxiety and its effectiveness in treating these diseases, especially when combined with other medications. However, there is a lack of complete consistency in the clinical results obtained, which may be attributed to the presence of confounding factors and the complex etiology of mental illnesses.

Additional research is required to comprehend the causes of depression and anxiety, explore vitamin D›s potential, and conduct thorough investigations into its therapeutic role as an adjunct in treating these disorders. This research should consider the complexities of psychiatric disorder origins, symptom severity, and the impact of environmental and genetic factors, including individual responses to vitamin D treatment.

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