Zero: 5000 iu has never been known to cause vit d toxicity, in fact 10, 000 iu is also not reported to cause toxicity. Most adults need 5-8000 iu/day to achieve optimal levels of vit d. In general the minimal dose known to cause toxicity is 40, 000 iu/day over a long period. See http://bit.Ly/1dc7vna.
Answered 2/22/2016
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