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Use of vitamin D3 (cholecalciferol) in sunscreens
Use of vitamin D3 (cholecalciferol) in sunscreens
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机译：维生素D3（胆钙化醇）在防晒霜中的使用
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摘要
Despite the widespread availability of highly-protective sunscreens, there is a worldwide epidemic of skin cancer. A possible reason for this is that sunscreens, while limiting damage to the DNA, may promote cancer growth by preventing vitamin D synthesis in the skin. To have biologic effects, Vitamin D must be converted to its active form, calcitriol, in a two-step process formerly thought to occur first in the liver and secondly in the kidney. It is now known, however, that this conversion can be accomplished entirely in the skin. Cutaneous activation of Vitamin D by ultraviolet light puts the potent anti-tumor effects of calcitriol at the site of tumor formation and in significant concentration, a fact seemingly ignored by workers in the field. A similar effect may be achieved by incorporating vitamin D into sunscreens. Because calcitriol also promotes cellular growth and differentiation, this also may be of benefit for photoaging.
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