I have a family history of seasonal affective disorder (SAD) or the winter blues

I have experienced a loss of mental sharpness or memory

I have sore or weak muscles

I have tender bones (press on your shin bone to see if it hurts,)

I work indoors

I avoid the sun

I wear sunblock most of the time

I live north of Florida

I don’t eat small, fatty fish such as mackerel, herring, or sardines (the main source of dietary vitamin D)

I have a family history of osteoporosis

I have broken more than 2 bones or had a hip fracture

I have a family history of autoimmune disease (such as multiple sclerosis)

I have osteoarthritis (vitamin D deficiency weakens bones and leads to deterioration)

I have frequent infections

I have a family history of prostate cancer

I have dark skin (any race other than Caucasian)

I am 60 years old or older