A 2022 study of National Health and Nutrition Examination Surveys (NHANES) data estimated that about 22% of Americans have a moderate vitamin D deficiency. Have you ever checked to see if you are deficient in vitamin D?

It's often difficult to get a full day's worth of vitamin D from diet alone, which is why getting outside — and sometimes adding supplements when medical professionals suggest it — is important, too. Do you take vitamin D supplements?

Symptoms of a vitamin D deficiency can include "muscle weakness, fatigue, mood changes, frequent infections, hair loss, bone pain and slow wound healing." If you're experiencing any of those symptoms, experts say it's best to check in with your primary care physician. Do you think you are deficient in vitamin d?