**3. Vitamin D**

Vitamin D, known as the sunshine vitamin, is a real hormone delivered from body's sterols by the photolytic activity of UV light on the skin [4]. It is a fat-soluble seco-steroid that may be either created within the skin from its precursor (7-dehydrocholesterol) by exposure to sunlight or offered from diet [5, 6]. Vitamin D with calcium, magnesium, and phosphorus plays a crucial role to support bones and teeth health [4].
