Sometime your doctor gets it wrong.
Most people under 70 need 400 international units of vitamin D per day, while those over 70 need 600.
But to make sure the RDA covered everyone, researchers set Iu levels at 600 to 800 units. Now, some doctors mistakenly believe patients are vitamin D deficient if their levels don’t fall within the 600 – 800Iu range.
Less than 6 percent of Americans ages 1 to 70 are deficient and only 13 percent are in danger of not getting enough.
The nutrient is crucial for strong bones and may play a role in other health conditions, though that is far less certain.
However Too much vitamin D can lead to high levels of calcium in the blood, which can cause nausea, constipation, kidney stones, an abnormal heart rhythm and other problems.