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'''Calcitriol''', or '''1,25-dihydroxycholecalciferol''' is the biologically active metabolite of vitamin D. It is classified as a steroid hormone and acts to raise blood calcium levels.  
 
'''Calcitriol''', or '''1,25-dihydroxycholecalciferol''' is the biologically active metabolite of vitamin D. It is classified as a steroid hormone and acts to raise blood calcium levels.  
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There are two dietary sources of Vitamin D3 -
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There are two dietary sources of Vitamin D3
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1. '''Vitamin D2''' is produced in plants (ergocalciferol).  
 
1. '''Vitamin D2''' is produced in plants (ergocalciferol).