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 D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis.itamin D in these foods is primarily in the form of vitamin D 3 and its metabolite 25(OH)D 3 [ 12 ]. Some mushrooms provide vitamin D 2 in variable amounts [ 13, 14 ]. Mushrooms with enhanced levels of vitamin D 2 from being exposed to ultraviolet light under controlled conditions are also available.