They measure vitamin D using one of two measurements: nanomoles per liter (nmol/l) or nanograms per milliliter (ng/ml). The following table provides rough ranges for low, normal, and high vitamin ...

The main complication of vitamin D toxicity is hypercalcemia, which is higher-than-normal levels of calcium ... you whether they are in the healthy range or if supplementation is necessary.

Vitamin D supplements may help prevent the loss of telomeres, DNA sequences that shrink with aging, a large study shows. But ...

There has been no consensus on the optimal level of vitamin D intake to reduce PTH, and this is why many laboratories report the normal range of vitamin D to be so wide (20 to 40 ng/ml ...

Taking too much vitamin D can cause serious side effects. Learn the signs, why you might feel weird after taking it, and when ...

However, it generally takes about 6-8 weeks of supplementation for your vitamin D levels to go back into the normal range. Even after your Vitamin D levels get normal, your doctor may still have ...

“When your vitamin D level is normal, you feel normal,” says NewYork-Presbyterian/Columbia University Irving Medical Center’s clinical dietitian Rachel O’Connor. “But even though you may ...

New research suggests vitamin D may help slow biological aging by reducing telomeres shortening, a key marker of cellular aging. Newsweek has reached out to some of the study's authors as well as ...

while those with normal vitamin D levels tend to have better cholesterol levels. Understanding how vitamin D and cholesterol interact can help ensure your levels stay within a healthy range.