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English Español Deutsch Français Italiano العربية 中文简体 Polski Português Nederlands Norsk Ελληνική Русский Türkçe אנגלית
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All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
Director (Drone Control; US military aircraft designation; as in D-21)
Deutschland (Germany) (International Auto Identification)
Dublin (car registration identification)
Duke (British title of nobility)
Daytime (broadcasting operating schedule)
Deaf (member of the Deaf Community who shares a sense of Deaf Culture)
Drag Force (aerodynamic equations)
Deaf (person who can not hear but is not part of the Deaf Community)
Doubtful (player's likelihood of participating)
Dominion Resources Inc (stock symbol)
Tunisian Dinar (unit of currency)
Dahlonega, Georgia (mint mark, 1838-61)
Diopter (unit of optical power)
Dextrorotary (clockwise optical rotaton)
Radioplane Company (manufacturer's symbol)
Pneumatic Post (Scott Catalogue prefix; philately)
D Sub-Shell (third outer subshell of an electron shell)
District spare (Stores 100 code)
Federal Reserve Bank of Cleveland, Ohio (designates original point of circulation of a dollar bill)
Cohen's Measure of Effect Size (statistics; usually expressed as italic d)
Deutschverzeichnis (Works of Schubert by Otto Erich Deutsch)
Undenominated United States Stamp (22 cents, introduced 17 Nov 1985)
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For information on vitamin D and COVID-19, see Dietary Supplements in the Time of COVID-19 .
Vitamin D (also referred to as “calciferol”) is a fat-soluble vitamin that is naturally present in a few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet (UV) rays from sunlight strike the skin and trigger vitamin D synthesis.
Vitamin D obtained from sun exposure, foods, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. The first hydroxylation, which occurs in the liver, converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as “calcidiol.” The second hydroxylation occurs primarily in the kidney and forms the physiologically active 1,25-dihydroxyvitamin D [1,25(OH)2D], also known as “calcitriol” [ 1 ].
Vitamin D promotes calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations to enable normal bone mineralization and to prev
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