Comparison of narrow-band ultraviolet B exposures and oral vitamin D substitution on serum 25-hydroxyvitamin D concentration
British Journal of Dermatology, 05/10/2012
Ala–Houhala MJ et al. – The present study shows that 12 narrow–band ultraviolet B (NB–UVB) exposures given during 4 weeks increase serum 25(OH)D concentration significantly more than 20μg of oral cholecalciferol daily. A short, NB–UVB course is an effective way to improve vitamin D balance in winter and the response is evident still 2 months after the course.