Health Articles : Vitamins and Supplements : Vitamin D
Vitamin D : Vitamin D Requirements
Vitamin D Deficiency SymptomsAny deformities or diseases of the bone can trace the basic deficiency symptoms of vitamin d. This is because of the fact that vitamin d controls the appropriate ..... There are two basis of vitamin D, natural sunlight and fortification of dietary foods, particularly dairy products and some cereals. The radiation that changes vitamin D in the skin is the same wavelength that causes sunburn, so careful application of sunscreen can inhibit vitamin D production. At northern latitudes, there is not enough radiation to change vitamin D, especially during the winter. After the age of 70 the skin does not change vitamin D effectively. Many vitamin D supplements also contain high contents of vitamin A and the recent studies have showed that vitamin A can increase bone resorption. The labels do not have to list the vitamin A, but it is time and again there, especially if it comes from cod liver oil. The Optimum brand or the Bartells brands have pure vitamin D, also called cholecalciferol.
Growing awareness that vitamin D insufficiency has serious health consequences beyond rickets and osteomalacia highlights the requirement for accurate assessment of vitamin D nutritional status. Although there is general agreement that the serum 25 (OH) of D level is the best indicator of vitamin D deficiency and sufficiency, the cutoff values have not been plainly defined. While laboratory reference varies for serum 25(OH) D levels are often based on average values from populations of healthy individuals, recent research suggests that health-based cutoff values aimed at preventing secondary hyperparathyroidism and bone loss should be considerably higher.
Vitamin D DosageVitamin d falls in the category of the fat soluble class of vitamins. It is very much effective in controlling some of the vital ..... In general, serum 25(OH) D values less than 20-25 nmol/L designate severe deficiency associated with rickets and osteomalacia. Although 50 nmol/L has been suggested as the low end of the normal range, more current research suggests that PTH levels and calcium absorption are not optimized until serum 25(OH) D levels reach approximately 80 nmol/L. Thus, at least one vitamin D expert has disagree that serum 25(OH) D values less than 80 nmol/L should be considered deficient, while another suggests that a healthy serum 25(OH) D value is between 75 nmol/L and 125 nmol/L. Data from supplementation studies designate that vitamin D intakes of at least 800-1,000 IU/day are required by adults living in temperate latitudes to achieve serum 25(OH) D levels of at least 80 nmol/L.
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