If you are listing your vitamin D level as 40 ng/ml (which we use in the U. S.), then that is fine. But in Europe, vitamin D levels are listed in units of nmol/L. So if your vitamin D level is actually 40 nmol/L, then that is deficient, and you need to take much more supplemental vitamin D. Any number below 50 nmol/L is defined as deficient, and any number below 75 nmol/L is considered to be insufficient.
Since Polly is an American, I'm pretty sure that when she said:
she was using standard English units (ng/mL). 60–90 ng/mL would be equivalent to 150–225 nmol/L.Polly wrote:Vitamin D3 is good - you want to keep your blood level between 60-90 if possible.
I'm sorry for the confusion that exists because of the differences in the units used in different countries.
Tex