the effect of 0.5 micrograms/d 1,25- ( oh ) 2d3 ( calcitriol ) in two divided doses compared favorably with that of 1 micrograms/d of 1 alpha ( oh ) vitamin d3 in a recently conducted multicenter , double-blind study on 596 patients with involutional osteoporosis .
C0006674
calcitriol
C0008318
vitamin d3