Collagen ke karolo ea bohlokoahali ea 'mele ea ho haha' me e etsa hoo e ka bang karolo ea 30 lekholong ea liprotheine 'meleng ea rona. Collagen ke protheine ea bohlokoa ea sebopeho e netefatsang momahano, elasticity le nchafatso ea lisele tsohle tsa rona tse hokahantsoeng, ho kenyeletsoa letlalo, li-tendon, ligaments, cartilage le masapo. Ha e le hantle, collagen e matla 'me e tenyetseha' me ke 'sekhomaretsi' se kopanyang tsohle. E matlafatsa likarolo tse fapaneng tsa 'mele hammoho le botšepehi ba letlalo la rona. Ho na le mefuta e mengata e fapaneng ea collagen ’meleng ea rōna, empa karolo ea 80 ho isa ho 90 lekholong ea eona ke ea Mofuta oa I, II kapa oa III, ’me bongata e le mofuta oa I oa collagen. Mofuta oa I oa collagen fibrils o na le matla a maholo a ho tsitlella. Sena se bolela hore li ka otlolloa ntle le ho robeha.