What is your approach to picking a dose/formulation of Vitamin D for a community-dwelling older adult found to have Vitamin D deficiency?

Supplementation with cholecalciferol (vitamin D3) 1000–2000 IU daily would be my choice for community-dwelling older adults with documented deficiency, and is preferred over ergocalciferol (vitamin D2). I would also co-administer calcium (1000–1200 mg/day) to support fracture prevention. Routine laboratory monitoring after initiation is generally unnecessary, except in special populations (e.g., malabsorption). 25(OH)D levels can be reassessed after about 4 months.

Target levels vary by guidelin...