In this study, mean 25-hydroxyvitamin D levels in patients with vitamin D insufficiency at baseline (25- hydroxyvitamin D, 22.5 to 37.5 nmol/ l [9 to < 15 ng/ ml]) increased from 30 nmol/ l (12.1 ng/ ml) to 40 nmol/ l (15.9 ng/ ml) at week 15 in the ADROVANCE (70 mg/ 2800 IU) group (n=75) and decreased from 30 nmol/ l (12.0 ng/ ml) at baseline to 26 nmol/ l (10.4 ng/ ml) at week 15 in the alendronate-only group (n=70).