Some samples exceeded the "provisional total tolerable intake" (PTTI) set by the US Food and Drug Administration (FDA) by a factor of 120.
BBC: US rice imports 'contain harmful levels of lead'
Some suggest as much as 10, 000 IU --currently the tolerable upper intake daily.
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The current tolerable upper limit of vitamin D intake is 50 mcg (2, 000 IU) per day.
CNN: How much vitamin D should someone over 55 take?
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