Mine was 13 when I had it tested thru grassroots.org - so I'm going with 6-8K IU a day and then retesting in 3 or 4 months and will adjust from there. Even if there was a large margin of error due to the way I was tested, I'm way below optimum levels.
Vit D is a hormone after all, and what level of supplement it takes to get you up to optimum levels varies as it would for thyroid or insulin or any other hormone. It isn't really good to think of it like Vit C with a more constant daily allowance.
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