Asayansi atsimikizira izi chiopsezo cha khansa ya m'mawere chimachepa kwambiri mwa amayi omwe amadya ascorbic acid (vitamini C) kwa nthawi yayitali. Kafukufukuyu, yemwe adakhazikitsa izi ndipo adatenga zaka 12, adakhudza amayi 3405 omwe adapezeka ndi khansa ya m'mawere.
Pa kafukufukuyu, khansa idapha anthu 1055, 416 mwa iwo adamwalira ndi khansa ya m'mawere. Kuwunika kwa zakudya za maphunzirowo, komanso, kutenga zowonjezera kunasonyeza kuti anapulumuka pambuyo matenda amapha, akazi amene, pamaso kudziwika khansa, mwadongosolo m'gulu zakudya za vitamini C.... Ndipo zakudya zonse zili ascorbic asidi.
Kumbukirani kuti ndi gawo la zipatso zonse za citrus - malalanje, tangerines ndi mandimu. Komanso chinanazi, tomato, adyo, sitiroberi, mango, kiwi ndi sipinachi, kabichi, mavwende, tsabola ndi zipatso zina ndi masamba. Kugwiritsa ntchito kwawo, ndi vitamini mu mawonekedwe ake oyera, monga momwe zasonyezedwera ndi kuyesa, kumachepetsa imfa ya odwala khansa ndi 25%. Ngakhale pamene gawo la tsiku ndi tsiku la zowonjezerazo ndi 100 mg yokha.