A Study of High-Dose Vit D Versus Standard of Care Vit D Supplementation

High dose vitamin D: Subjects will receive 50,000 IU vitamin D2 weekly x 16 weeks followed by 4,000 IU of vitamin D3 daily with a goal 25(OH)D level of ≥45 but ≤80 ng/mL.

Standard of Care Vitamin D: Vitamin D will be supplemented to 25(OH)D levels, with a goal 25(OH)D level of \>30 ng/mL according to Endocrine Society Practice Guidelines.