the average rate of absorption of 1,25-dihydroxyvitamin d3 [ 1,25 ( oh ) 2d3 ] was two- and fivefold higher than that of 25-hydroxyvitamin d3 [ 25 ( oh ) d3 ] and vitamin d3 ( d3 ) , respectively .
C0006657
25-hydroxyvitamin d3
C2713074
25 ( oh ) d3