Mā te Huaora D tō tinana e āwhina ki te mimiti i te konupūmā me te pupuri i ngā wheua kia kaha puta noa i tō oranga. Ka whakaputahia e tō tinana te huaora D ina pā mai ngā hihi UV o te rā ki tō kiri. Ko ētahi atu puna pai o te huaora ko te ika, ngā hua manu, me ngā hua miraka kua whakakahangia. Kei te wātea hoki hei tāpiringa kai.

Me haere te huaora D i roto i ētahi tukanga i roto i tō tinana i mua i te whakamahinga a tō tinana. Ko te huringa tuatahi ka puta i roto i te ate. I konei, ka hurihia e tō tinana te huaora D ki tētahi matū e mōhiotia ana ko te 25-hydroxyvitamin D, e kiia ana ko te calcidiol.

Ko te whakamātautau 25-hydroxyvitamin D te huarahi pai rawa atu ki te aroturuki i ngā taumata huaora D. Ko te nui o te 25-hydroxyvitamin D i roto i tō toto he tohu pai mō te nui o te huaora D kei roto i tō tinana. Ka taea e te whakamātautau te whakatau mēnā he tiketike rawa, he iti rawa rānei ō taumata huaora D.

E mōhiotia ana hoki te whakamātautau ko te whakamātautau huaora D 25-OH me te whakamātautau calcidiol 25-hydroxycholecalcifoerol. He tohu nui pea tēnei mōwheua wheua(ngoikoretanga o te wheua) me tete mate rīkete(te hanganga hē o te wheua).

Tērā pea ka tono tō tākuta i tētahi whakamātautau huaora D 25-hydroxy mō ētahi take rerekē. Ka taea e ia te āwhina i a rātou ki te whakatau mēnā he nui rawa, he iti rawa rānei te huaora D e ngoikore ai te wheua, e rerekē ai rānei ētahi atu āhuatanga. Ka taea hoki e ia te aroturuki i te hunga e mōrearea ana ki te whaite korenga o te huaora D.

Ko te hunga e tino mōrearea ana ki te iti o te huaora D ko:

• ngā tāngata kāore e nui te pānga o te rā
• ngā kaumātua
• ngā tāngata momona
• ngā pēpi e whāngaihia ana ki te ū anake (ko ngā pēpi miraka ka whakakahangia ki te huaora D)
• ngā tāngata kua pokangahia te puku
• ngā tāngata e pāngia ana e te mate e pā ana ki ngā whekau, ā, e uaua ai te mimiti o ngā matūkai ki te tinana, pērā i teTe mate a Crohn

Tērā pea ka hiahia tō tākuta kia whakamātauria e koe te 25-hydroxy vitamin D mēnā kua tāpaetia kētia he ngoikore tō huaora D, ā, e hiahia ana hoki kia kite mēnā kei te whai hua te maimoatanga.