Doctors check vitamin D levels in the blood by measuring 25(OH)D. This helps them see how much vitamin D a person is getting. But scientists are still not sure exactly how these levels affect overall health.
Experts from a health organization studied vitamin D needs and made these conclusions:
- Less than 30 nmol/L (12 ng/mL)—This is too low and can cause serious problems like rickets in children (soft, weak bones) and osteomalacia in adults (bone pain and weakness).
- Between 30 to 50 nmol/L (12 to 20 ng/mL)—This is not enough for strong bones and good health.
- 50 nmol/L (20 ng/mL) or higher—This is good for most people.
- More than 125 nmol/L (50 ng/mL)—This may cause health problems, especially if it goes over 150 nmol/L (60 ng/mL).
Some experts say healthy people do not need to check their vitamin D levels often. Also, the best vitamin D level may be different for different people based on their age, race, and body needs.
If someone takes vitamin D supplements, their blood levels will go up, but the amount of increase is not the same for everyone. It depends on how much vitamin D they already have and how long they take the supplement.
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