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Adults (18 years and older)
Amount per capsule Vitamin D .......1250% (as Vitamin D) Cholecalciferol.
Vitamin D is included in most multivitamins, usually in strengths from 50 IU to 1,000 IU (international units), as softgels, capsules, tablets, and liquids. Since 2000, discrepancies have arisen regarding the benefits of vitamin D and how much is sufficient. Safety research supports an upper limit of a dose of vitamin D to be more than or equal to 250 micrograms daily (10,000 IU of vitamin D3). The Institute of Medicine (IOM) has reviewed and updated the Dietary Reference Intakes (DRIs). The IOM found that there is strong evidence to support the use of vitamin D with calcium for bone health but that it was lacking for other health conditions. The new recommended daily allowance (RDA), as set in 2010, is based on age, as follows: for those 1-70 years of age, 600 IU daily; for those 71 years and older, 800 IU daily; and for pregnant and lactating women, 600 IU daily. The IOM further recommended that serum 25(OH)D levels of 20ng/mL (= 50 nmol/L) is adequate, and levels > 50ng/mL (= 125 nmol/L) could have potential adverse effects. This level can be achieved through substantial daily skin exposure to sunlight.
Not all doses have been found to be effective for conditions that have been studied.