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It doesn't say that I can see on this page, but I suspect that it is showing results based on the "Recommended" daily allowance of Vitamin D.

I also suspect, and guide my personal Vitamin D...

Let me guess - you do not live at high latitudes, you are not very dark skinned, and you are not a computer nerd who works mostly at night and indoors ?

My present understanding is that both too...

I'll wager you meant 3 or 4 thousand IU :).

You might not have used enough Vitamin C :).

Or you might have been more deficient in Vitamin D than C.

They're all essential, and the optimum amounts, in my experience, are substantially...