Season, latitude, and ability of sunlight to promote synthesis of vitamin D3 in skin.
Season, latitude, skin pigmentation, and life-style factors affect the availability of ultraviolet radiation from the sun for photoconversion of 7-dehydrocholesterol to previtamin D3 in the skin of humans.
D002980:Climate; D006801:Humans; D008019:Life Style; D012621:Seasons; D012867:Skin / Q000187:drug effects / Q000378:metabolism*; D013472:Sunlight; D014807:Vitamin D / Q000096:biosynthesis*
D014807:Vitamin D