​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. Raising vitamin D isn’t as simple as just swallowing a pill. Behind the lab number, your body is juggling complex processes: absorption, metabolism, storage, all of which can hit roadblocks you might not even notice.

In all truth, it’s not just the intake. You can be religious with your supplement, top up at the same time every day, and still see little to no change. So what exactly is happening: why do you keep running low on it despite taking vitamin D religiously?