2. Kusamalira khungu, collagen ndi yabwino pakhungu ndi kuthekera kusamalira bwino khungu, kukongola, chifukwa collagen ili ndi ntchito yopatsa thanzi pakhungu, imatha kusunga bwino kulimba kwa khungu, kusunga chinyezi chake komanso kulimba pang'ono, kukonza khungu lowonongeka, kulimbitsa bwino khungu, makwinya, kusunga chinyezi;