Oral Vitamin D Supplementation Combined With Phototherapy as a Treatment for Vitiligo

A randomized clinical trial, triple-blind, placebo-controlled treating patients with diagnosed vitiligo. The intervention group will be treated with oral vitamin D 5,000 IU per day and NB-UVB phototherapy. The control group will be treated with placebo and NB-UVB phototherapy. We will evaluate the efficacy (repigmentation rate) and improvement of the quality of life with vitamin D and phototherapy versus placebo and phototherapy. Our objectives are: * Evaluate if the use of the supplementation with oral vitamin D accelerates the repigmentation rate in vitiligo lesions treated with NB-UVB phototherapy, achieving a lower accumulated dose of phototherapy. * Compare basal blood levels of vitamin D before and after treatment completion. * Compare quality of life of the intervention group with the control group. * Associate pigmentation rates between intervention and control group obtained with tools that assess activity of disease, such as, Vitiligo Area and Severity Index (VASI) and Vitiligo European Task Force (VETF) score. * Compare results in quality of life between intervention and control group obtained with tools, such as, Vitiligo-Specific Quality-of-Life Instrument (VitiQoL) and Dermatology Life Quality Index (DLQI).