Kolagen ni poroteyine itanga ingirangingo z'umubiri imiterere, ubukana, gukomera, hamwe nimiterere. Iboneka mu magufa, karitsiye, imitsi, n'uruhu.
Ibiryo bya poroteyine nyinshi biteza imbere umusaruro wa kolagen, harimo inyama, amafi, amagi, n’amata. Kolagen ikenera kandi intungamubiri nka vitamine C (iboneka mu mbuto, icyatsi kibisi, n'inyanya) na zinc.