![]() ![]() ![]() At higher latitudes, the amount of vitamin D–producing UVB light reaching the earth's surface goes down in the winter because of the low angle of the sun. Here are nine factors that can influence a person's vitamin D level:ġ. The liver, and then the kidneys, are involved in the steps that eventually result in a bioavailable form of the vitamin that the body can use. You can get the vitamin from food (mainly because it's been added few foods are natural sources of vitamin D) and by taking supplements (many doctors recommend taking 800 IU of vitamin D 3 a day).īut vitamin D is also produced by the body in a complex process that starts when rays in the invisible ultraviolet B (UVB) part of the light spectrum are absorbed by the skin. ![]() ![]() Don't let your vitamin D absorption slip awayįiguring out all the factors that can affect a person's vitamin D levels is complicated.
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