I-Vitamin D isiza umzimba wakho ukumunca i-calcium futhi ugcine amathambo aqinile kukho konke ukuphila kwakho. Umzimba wakho ukhiqiza uvithamini D lapho imisebe yelanga ye-UV ithinta isikhumba sakho. Eminye imithombo emihle yaleli vithamini ihlanganisa izinhlanzi, amaqanda, nemikhiqizo yobisi eqinisiwe. Iyatholakala futhi njengesengezo sokudla.

I-Vitamin D kufanele idlule ezinqubweni eziningana emzimbeni wakho ngaphambi kokuba umzimba wakho ukwazi ukuyisebenzisa. Ukuguqulwa kokuqala kwenzeka esibindini. Lapha, umzimba wakho uguqula i-vitamin D ibe ikhemikhali eyaziwa ngokuthi i-25-hydroxyvitamin D, ebizwa nangokuthi i-calcidiol.

Ukuhlolwa kwevithamini D okungama-25-hydroxy kuyindlela engcono kakhulu yokuqapha amazinga kavithamini D. Inani le-25-hydroxyvitamin D egazini lakho liyinkomba enhle yokuthi ungakanani uvithamini D umzimba wakho. Ukuhlolwa kunganquma ukuthi amazinga akho kavithamini D aphakeme kakhulu noma aphansi kakhulu.

Ukuhlolwa kwaziwa nangokuthi ukuhlolwa kwe-vitamin D okungu-25-OH kanye nokuhlolwa kwe-calcidiol 25-hydroxycholecalcifoerol. Kungaba inkomba ebalulekilei-osteoporosis(ubuthakathaka bethambo) kanyeama-rickets(ukonakala kwethambo).

Udokotela wakho angase acele ukuhlolwa kwe-vitamin D ye-25-hydroxy ngezizathu eziningana ezahlukene. Kungabasiza ukuthi babone ukuthi uvithamini D omningi noma omncane kakhulu ubangela ubuthakathaka bamathambo noma okunye okungajwayelekile. Ingakwazi futhi ukuqapha abantu abasengozini yokuba ne-ukuntuleka kwevithamini D.

Labo abasengozini enkulu yokuba namazinga aphansi kavithamini D bahlanganisa:

• abantu abangakutholi kakhulu elangeni
• abadala abadala
• abantu abanokukhuluphala ngokweqile
• izingane ezinceliswa ibele kuphela (ifomula ngokuvamile iqiniswa ngovithamini D)
• abantu abaye bahlinzwa yi-gastric bypass
• abantu abanesifo esithinta amathumbu futhi kwenza kube nzima ukuba umzimba ukumunca imisoco, ezifanaIsifo sikaCrohn

Udokotela wakho angase futhi afune ukuthi wenze ukuhlolwa kwevithamini D engu-25-hydroxy uma sebekutholile ukuthi untula uvithamini D futhi befuna ukubona ukuthi ukwelashwa kuyasebenza yini.