Vitamin D Test Results: I Won

I got my Vitamin D3 test results last week: after taking 5000 IU of D3 daily for about 3 months, the level of "Vitamin D, 25-OH" in my blood is 75 ng/ml.  The results sheet says that the reference range is 32-100 and that "the range considered by most experts as optimal for health" is 50-70.  The Vitamin D Council says 50-80:

Quoting Vitamin D Council:

The body does not reliably begin storing cholecalciferol in fat and muscle tissue until 25(OH)D levels get above 50 ng/ml.  The average person starts to store cholecalciferol at 40 ng/ml, but at 50 ng/ml virtually everyone begins to store it for future use.  That is, at levels below 50 ng/ml, the body uses up vitamin D as fast as you can make it, or take it, indicating chronic substrate starvation—not a good thing.  25(OH)D levels should be between 50–80 ng/ml, year-round.

The test results sheet also has this to say about toxicity:

Be aware that Vitamin D levels greater than 150 ng/mL may lead to toxicity and high calcium levels.  This may be dangerous.  These levels are only achieved with supplementation, so if you are supplementing with high levels of Vitamin D (greater than 10,000 IU) then testing is strongly recommended.

Posted by Anthony on 2 replies


01. Feb 23, 2010 at 10:29am by Fred:

Wondering what was your blood D3  level befor you started taking this supplement?

02. Feb 27, 2010 at 12:28pm by Anthony:

I didn’t test my level beforehand, because the test is a little expensive ($65 or so) especially compared to the vitamin D itself which is about $5 for a 4-month supply.

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