Land affected or burdened by an easement is called a servient estate, while the land or person benefited by the easement is known as the dominant estate.. If the easement benefits a particular piece of land, it is said to be appurtenant to the land.
Vitamin D obtained from sun exposure, food, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. The first occurs in the liver and converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as calcidiol.
Vitamin D3 (cholecalciferol) is the type produced in the body in response to exposure to the sun's ultraviolet B rays. 1  Vitamin D2 (ergocalciferol) is synthesized in plants. Both types must be converted in the liver and kidneys to the active form, 1,25 dihydroxyvitamin D, to be utilized in the body.