it is metabolized primarily in the liver to the major circulating form 25-hydroxy vitamin d3 , [ 25 ( oh ) d3 ] which is metabolized in the kidney to produce the biologically active form of the hormone , 1,25-dihydroxy vitamin d3 , [ 1,25 ( oh ) 2d3 ] .
C0006657
25-hydroxy vitamin d3
C2713074
25 ( oh ) d3