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| Vitamin D is manufactured in the skin following direct exposure to sunlight. The amount of vitamin D produced in the skin varies depending on time of day, season, latitude and skin pigmentation. Usually 10-15 minutes exposure of hands, arms and face two to three times per week (depending on one's skin sensitivity) is enough to satisfy the body's vitamin D requirement. Use of sunscreen markedly diminishes the manufacture of vitamin D in the skin, as does window glass, clothing and air pollution. The fairer your skin color, the more vitamin D you make. People who are housebound and experience no sunlight exposure are unable to make vitamin D. First, while ultraviolet radiation generates free radicals that can do damage, dietary antioxidants and skin pigmentation are nature's way of fighting free radicals. |
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