A small suberythemal UVB dose every second week is sufficient to maintain summer vitamin D levels: a randomized controlled trial.

Abstract

Background:  It is known that ultraviolet-B (UVB) radiation increases serum vitamin D level (25-hydroxyvitamin D3 (25(OH)D)). However, there is uncertainty about the relationship between the maintenance of vitamin D status and UVB.


Objective:  To define the frequency of UVB exposure necessary for maintaining summer 25(OH)D levels during the winter.


Patients/Methods:  A total of 60 participants were included from October 2008 to February 2009 (16 weeks) and randomized for UVB exposure of 1 standard erythema dose (SED) to ∼88% body area once a week (n = 15 completed), every second week (n = ...

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