50 - Minimum acceptable blood level of vitamin D (in ng/mL) for optimal function.
75-125 - Ideal level (in ng/mL) of vitamin D.
200 - Amount of IUs (international units) recommended by the US Food & Drug Administration per day for adults to prevent osteomalacia - not for optimal health.
400 - Amount of IUs recommended by the US Food & Drug Administration per day for children to prevent rickets - again, not for optimal health.
5,000 - Amount of IUs recommended for adults to boost Vitamin D levels by 50 ng/mL within 3 months.
10,000 - Amount of IUs recommended for adults to boost vitamin D levels by 100 ng/mL within 3 months.
20,000 - Average amount of IUs generated by individuals when sunbathing in the summer with maximum skin exposure, for roughly 15 minutes.
156,000–2,604,000 - Amount of IUs a man unknowingly took daily for 2 years, which produced one of the few documented instances of vitamin D toxicity. He recovered with sunblock, steroids, and discontinuing the (poorly measured) vitamin D supplement.
Source: Vitamin D Council
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