Important nutritional forms of vitamin D in man are Calceferol (vitamin D2) and cholecalciferol (vitamin D3) calciferol may be derived by the irradiation of the plant sterol, rda vitamin d ergosterol, cholecalciferol is Made natural vitamin D found in animal fats and fish liver oils. It also results from exposure to the sun's UV rays that converts cholesterol in the skin to vitamin D. Vitamin D is stored in rda vitamin d adipose deposits.
Daily requirements: The daily requirement of vitamin D are:
Adults - 2.5 mcg (100 IU)
Babies and rda vitamin d children - 5,0 mcg (200 IU)
Pregnancy and lactation - 10.0 mcg (400 IU)
(One international unit (IU) of vitamin D = 0.025 mg calciferol, that is to be converted into micrograms IU, divided by 40).
Sources: Vitamin D is unique because it is derived from sunlight and food
(A) Sunlight: Vitamin D is synthesized in the body by the action of rda vitamin d UV light from the sun dehydrocholesterol 7, which is stored in abundance in the skin. Exposure to UV rays is critical; these can be separated by the pollution of the air filter. Aces dark skin, like blacks also suffer from this disadvantage because black skin can filter up to 95 percent of UV rays.
(B) Food: vitamin occurs only in animal foods. Liver, egg yolks, rda vitamin d butter and cheese and some fish species contain useful amounts. Fish liver oils, but is not regarded as a food, are the richest sources of vitamin D. Human milk has recently been shown to contain significant amounts of rda vitamin d soluble sulfate in the water of the vitamin D . rda vitamin d Other sources of vitamin D are foods artificially fortified with vitamin D, such as milk, margarine, vanaspathi and baby foods. More about sources of vitamin D and Benefits
See also Vitamin Information - Benefits, rda vitamin d Deficiency, Sources
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