Amavithamini ngokuvamile anezici ezilandelayo: kulula ukuncibilika emanzini, ukuncibilika kalula emafutheni, futhi alawule umzimba.
1. Kulula ukuncibilika emanzini: Amanzi-amavithamini ancibilikayo abonakala ngokuncibilika kwawo okuphezulu emanzini futhi akhishwa emchamweni ngemva kokuwadla. Amanzi-amavithamini ancibilikayo ngokuvamile ahlanganisa uvithamini C, uvithamini B2, novithamini B1
2. Kulula ukuncibilika emafutheni: Amafutha-amavithamini ancibilikayo abonakala ngokuncibilika kwawo emafutheni noma kwizincibilikisi zemvelo, kodwa hhayi emanzini. Kudingeka zithathwe nokudla okunamafutha amaningi ukuze kuthuthukiswe ukumuncwa. Amafutha-amavithamini ancibilikayo ngokuvamile ahlanganisa uvithamini A, uvithamini D, novithamini E.
3. Lawula umzimba: Amavithamini adlala indima ekulawuleni umzimba. Njengama-organic compounds, amavithamini abalulekile ekukhuleni nasekuthuthukeni komuntu, okunquma impilo yonke. Ziyimisoco ebalulekile ekuthuthukisweni okujwayelekile futhi zibuye zibhekwe njengezisusa zemetabolism, zisiza ngempumelelo kumetabolism yomzimba.
Kunezinhlobo eziningi zamavithamini, wonke adlala indima ebalulekile emzimbeni womuntu. Uma kutholwa ukuntula kwamavithamini, kufanele kwengezwe ngokushesha ngaphansi kokuqondisa kukadokotela ukuze kugwenywe{1}}ukuntuleka kwesikhathi eside okubangela ukulimala emzimbeni.