​Taking vitamin D every day but still running low? Doctors explain what may be stopping your levels from rising​

This goes the same way with any and every supplement; vitamin D is no exception. You start taking vitamin D every day, expecting your blood levels to rise, but your next test comes back almost as low as before. That all-too-familiar frustration of doing “everything right” and not getting anywhere is almost inescapable.Now, it’s tempting to just blame the supplement. Maybe it’s the wrong brand. Maybe the dose is too low. But physicians urge people to step back and look at the bigger picture. Rais