Vitamin D is also special in the sense that it's a hormone.
> People can make a point of adding more dietary vitamin D or making sure to get a little more exposure to sunlight daily.
Getting sufficient vitamin D from diet alone is difficult. UV exposure also has risks, which may be higher for some. The required exposure time is measured in minutes a day. If you are still deficient it may be better to supplement, rather than getting exposed to UV for more time.
> People can make a point of adding more dietary vitamin D or making sure to get a little more exposure to sunlight daily.
Getting sufficient vitamin D from diet alone is difficult. UV exposure also has risks, which may be higher for some. The required exposure time is measured in minutes a day. If you are still deficient it may be better to supplement, rather than getting exposed to UV for more time.