You could also try an at-home test for vitamin D deficiency, but it's up to you to do your research on the testing company and make sure it meets lab safety, accuracy and efficacy standards.

Either way, before you start spending money on a supplement that may or may not work, you can try these six tactics for getting more vitamin D. .

If it's super sunny outside, you may not need to open the window for more than 10 to 15 minutes to increase your vitamin D production.

Morning light isn't as harsh as sunlight later in the day, but you can still meet at least some of your vitamin D needs this way?

Fish are one of the best food sources of vitamin D.

According to the US Office of Dietary Supplements, fatty fish such as tuna, salmon and mackerel are some of the best natural (i.e., not fortified) sources of vitamin D. .

In fact, according to the United States Department of Agriculture Food Composition Database, one 100-gram serving of Atlantic farmed salmon can just about meet your day's requirement for vitamin D at 526 IUs. .

While most adults today grew up hearing that eggs were bad for their heart, that myth has since been disproven (see here, here, here and here) and it turns out that eggs are one of the few food sources that naturally contain vitamin D. .

Eggs alone aren't enough to meet the daily vitamin D requirement, but they're a healthy, protein-packed way to help get there.

CNET definitely doesn't advocate for unprotected sun exposure, but there is a delicate balance to be struck between skin safety and vitamin D intake

Since the bulk of most people's vitamin D comes from casual exposure to the sun, taking a walk at lunch could provide for most of your vitamin D needs

In fact, one study done in the UK found that less than 15 minutes of midday sun exposure is enough to maintain sufficient blood levels of vitamin D in healthy adults