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Officials say 600 IUs of vitamin D daily
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is enough, but a massive statistical
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error means you might actually need
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nearly 9,000. Official guidelines are
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mathematically designed to ensure 97.5%
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of the population stays above a healthy
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threshold. To find that perfect dose,
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researchers plotted data from 10
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different studies onto a graph, but they
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made a foundational error. They plotted
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the average results of those groups. At
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just 600 IUs, those group averages
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clustered neatly above the target
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healthy line. But a high-class average
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doesn't mean every single student passed
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the test. Expanding those tight groups
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into individual data points reveals a
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massive vertical spread. Looking at
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individual variants, 97.5%
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of people taking 600 IUs fall completely
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below the healthy line. To fix the math,
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you have to shift that wide cluster far
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to the right. To ensure that 97.5%
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bracket actually crosses the threshold,
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the required dose skyrockets to 8,900
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IUs. But don't blindly swallow 9,000
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IUs. Absorption depends heavily on your
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body fat, age, and skin tone. So you
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must test your own blood levels to know
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exactly where you stand. But this
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statistical blunder explains exactly why
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popping a standard 600 IU supplement
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might still leave you completely
