Narrowband ultraviolet B three times per week is more effective in treating vitamin D deficiency than 1600 IU oral vitamin D-3 per day: a randomized clinical trial
Background It is known that narrowband ultraviolet B (NB-UVB) radiation and oral vitamin D-3 supplementation can both improve serum levels of vitamin D, expressed as 25-hydroxyvitamin D-3 [25(OH)D-3]. However, surprisingly few studies have compared the effects of the two interventions in treating vitamin D deficiency. Objectives To compare the effect of NB-UVB exposure with oral vitamin D-3 supple