the traditional management of exogenous ( sunlight ) or endogenous ( malabsorption ) vitamin d deficiency without evidence of disordered vitamin d metabolism has not changed , since it consists of treatment with vitamin d itself -- a therapy which preserves the normal intrinsic mechanisms for regulating the rate of production of 1,25-dihydroxycholecalciferol .
C0024523
malabsorption
C0014695
vitamin d