Dihydroxyvitamin D3
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Dihydroxyvitamin D3 may refer to:

 1,25-Dihydroxycholecalciferol (1,25-dihydroxyvitamin D3)
 24,25-Dihydroxycholecalciferol (24,25-dihydroxyvitamin D3) 
 Tacalcitol (1,24-dihydroxyvitamin D3)