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Vitamin D (the inactive version) is mainly from two forms: vitamin D 3 and vitamin D 2. Vitamin D 3, or cholecalciferol, is formed in the skin after exposure to sunlight or ultra violet radiation or from D 3 supplements or fortified food sources. Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3]
Metabolites produced from vitamin D 2 tend to bind less well to the vitamin D-binding protein. [3] Vitamin D 3 can alternatively be hydroxylated to calcifediol by sterol 27-hydroxylase, an enzyme coded for by gene CYP27A1, but vitamin D 2 cannot. [3] Ergocalciferol can be directly hydroxylated at position 24 by the enzyme coded for by CYP27A1. [3]
Mapping of several bone diseases onto levels of vitamin D (calcidiol) in the blood [6] Normal bone vs. osteoporosis. Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body.
2. Vitamin D. Vitamin D is present in a limited number of foods—fatty fish and cod liver oil are some of the best food sources. ... Protein can help maintain muscle mass while losing weight ...
Ergocalciferol, also known as vitamin D 2 and nonspecifically calciferol, is a type of vitamin D found in food. It is used as a dietary supplement [3] to prevent and treat vitamin D deficiency [4] due to poor absorption by the intestines or liver disease. [5]
Common, most foods do not contain vitamin D, indicating that a deficiency will occur unless people get sunlight exposure or eat manufactured foods purposely fortified with vitamin D. Vitamin D deficiency is a known cause of rickets, and has been linked to numerous other health problems. [46] [47] Vitamin E deficiency
Weight fluctuations of five pounds are more are uncommon among men. Experts explain common sudden weight gain causes, what to do, and when to see a doctor. 12 Common Causes of Sudden Weight Gain
The Institute of Medicine in 2010 recommended a maximum uptake of vitamin D of 4000 IU/d, finding that the dose for lowest observed adverse effect level is 40,000 IU daily for at least 12 weeks, [25] and that there was a single case of toxicity above 10 000 IU after more than seven years of daily intake; this case of toxicity occurred in ...