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

Inclusion Criteria: * Males or females, ≥ 18 years of age at the time of signing the informed consent document. * ≥5% of affected skin area * Inactive, generalized vitiligo (inactive for a minimum of 6 months). \[Inactive: No new spontaneous lesions or a rapid progression of these.\] * Subjects who have not been treated with phototherapy previously. * Subject who have not been treated with topical corticosteroids for at least 8 weeks or immunomodulators for at least 12 weeks. Exclusion Criteria: * Subjects with \<5% of affected skin area * Subjects who use multivitamins, diuretics, lipase-inhibitors (orlistat) * Subjects with calcium disorders (for example: primary hyperparathyroidism) or patients with hepatic/kidney failure. * Subjects with malabsorption gastrointestinal disorders * Pregnant women or in lactation * Subjects with cancer * Subjects with previous history of skin cancer (melanoma/non-melanoma) * Photo-sensible diseases (actinic dermatitis, porphyria, xeroderma pigmentosa) or drugs * Subjects using immunomodulator o immunosuppressor treatments * Subjects who practice activities that require prolonged sun exposure.