Assertion: vitamin d's benefit | /r/HasProperty | source
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text: Since 2010, the recommended daily allowance (RDA) of vitamin D falls between 600 and 800 International Unit (IU) per day (based on age), but new research suggests adults may actually need at least 2,000 IU of vitamin D every day to maintain a healthy level in the body and reap the most benefits [source: MayoClinic, Holick].