The best way to take vitamin D has not yet been determined. Because it is a fat-soluble vitamin, taking daily supplements is not the only option. If daily dosing is chosen, it should consist of at least 800 I.U. per day, with doses of 1,600-2,000 I.U. per day for older individuals who are deprived of exposure to sunlight.
Another option is to use less frequent megadoses of 50,000 I.U. of vitamin D3 (cholecalciferol). Taking two such tablets once monthly is probably the easiest and cheapest way to take vitamin D. Consult your physician or other healthcare professional before taking vitamin D more frequently, because of the serious possibility that vitamin D toxicity can lead to the development of markedly elevated calcium levels (hypercalcemia), which can have serious health consequences.
Vitamin D supplements can be recommended for many older adults, especially people who receive limited exposure to sunlight, such as those living in a long-term care setting.
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