![]() ![]() The liver then converts vitamin D 3 into a form of D 3 known as 25-hydroxyvitamin D 3, or calcidiol. When exposed to adequate UVB sunlight, 7-dehydrocholesterol is converted into a molecule known as “pre-vitamin D 3,” which then undergoes a second molecular change and becomes vitamin D 3, also known as cholecalciferol. The outer layer of the skin, called the epidermis, produces a form of vitamin D called 7-dehydrocholesterol. Whether acquired from diet, sunlight, or supplements, vitamin D eventually reaches our bloodstream. This plant source of vitamin D is known as vitamin D 2, or ergocacliferol, which is an inactive form of vitamin D and may be taken as a supplement. Additionally, vitamin D may be acquired through the diet from a few plant sources. The majority of vitamin D is synthesized in our skin. The specific physiology of achieving active vitamin D consists of an intricate process involving various organs – namely the skin, liver, and kidneys. Its complex activation process is described below. ![]() Its basic structure comes from the cholesterol molecule, and it is categorized as a steroid molecule. Although we call it a vitamin, vitamin D acts much like a hormone in our bodies. ![]() Why? Much of this is because vitamin D is a unique vitamin that is supplied to our bodies by the sun’s ultraviolet type B (UVB) rays. Vitamin D, also known as “the sunshine vitamin,” is one of the most well-known nutrients. ![]()
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