SLE by ACR criteria (revised 1997)

African American, participating in the SLE in Gullah Health (SLEIGH) Study

Outpatient

Stable disease with no BILAG A or B in any system for the past 4 weeks

Stable prednisone (or equivalent corticosteroid) dose ≤ 20 mg/day for ≥ 4 weeks prior to study entry

Baseline 25(OH)D concentration of \< 30 ng/ml

Willingness to discontinue other vitamin D supplements and/or multivitamins containing vitamin D while participating in the study

Age 18 - 85 years

Ability to complete questionnaires in English

Ability to give informed consent

Vitamin D Therapy in Patients With Systemic Lupus Erythematosus (SLE)