title: [Effect of the sun on circulating 25-hydroxycalciferol levels in normal subjects in Switzerland].
abstract: The principal source of human natural vitamin D is cholecalciferol produced in skin by the action of ultraviolet light. Plasma levels of 25-hydroxyvitamin D (25-OH-D), the hepatic metabolite of cholecalciferol, increased by 39.3% in 20 healthy young Swiss subjects after a 3-week holiday in the sun. Significant increases of circulating 25-OH-D (p smaller than 0.001) were found as much as 2 months later when compared with a group not deliberately exposed to sunshine. A short vacation in the sun therefore appears to be beneficial in replenishing vitamin D body stores.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D008297:Male; D008875:Middle Aged; D012063:Relaxation; D013472:Sunlight; D013557:Switzerland; D013997:Time Factors; D014807:Vitamin D / Q000378:metabolism
chemical_list: D006887:Hydroxycholecalciferols; D014807:Vitamin D
vernacular_title: Influence du soleil sur le taux circulant de 25-hydroxycalciférol chez des sujets normaux en Suisse.