serum levels of the circulating form of vitamin d3 , 25-hydroxycholecalciferol [ 25- ( oh ) d3 ] , were determined in 59 university students , 26 males and 33 females , aged 18 to 26 yr and in 24 elderly subjects , 13 males and 11 females , with a mean age of 62 +/- 13 yr .
C0006657
25-hydroxycholecalciferol
C2713074
25