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Well, according to the D gospel, the recommended daily amount (400 IU) is nowhere near what the average person really needs to maintain appropriate blood levels anyway. Up until 1990, all infants in East Germany routinely received 600,000 IU every three months at their pediatric checkups until they were 18 months old, after studies done within the country in the early 50s showed that nearly all infants were severely deficient in their blood levels. But when the wall came down, that practice and the research behind it got lost in the unification of the two medical systems.
Nowadays you can order a home blood test. Both kids had already been done as part of their medical workups (and were far below healthy levels, so now we supplement,) but my mother and I did ours out of curiosity. Both severely deficient, despite the fact that my mother had already been supplementing with twice the recommended allowance. I'm convinced it's one of a number of contributing factors for autism, anyway.
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