1. Edward Hutchinson Edward Hutchinson United Kingdom says:

    400iu is a very low daily dose. Most people whatever their age require 100 iu for each 2.5lbs they weigh or 1000iu daily for each 25lbs. So 400iu = sufficient for a 10lb baby but it's ludicrous to think the same amount is suitable for a 50lb kid or a 100lb teenager.

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