Vitamin D is essential for various physiological functions, including immune system function, bone health, and the growth and development of bones and teeth. It aids in the absorption of calcium and phosphorus, which are crucial for maintaining strong bones and teeth [1][2]. A deficiency can lead to conditions such as rickets in children and osteomalacia in adults, causing softening of the bones and associated pain [5][6].

Moreover, vitamin D may influence mood regulation and help reduce the risk of depression, particularly in individuals who are already deficient [2][4]. Given that adequate sun exposure is often insufficient, especially in winter, dietary sources and supplements become critical for maintaining optimal levels [3][6].

What is the importance of vitamin D?

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