ʻO ka hapa nui o nā protein hana i loko o ke kino i loaʻa mai ka collagen, he mea koʻikoʻi hoʻi no ka ʻili, ka ʻiʻo, a me ka iwi. ʻO Glycine, proline, hydroxyproline, a me nā waikawa amino ʻē aʻe he nui i loko o ke kino kanaka. Pono ia no ka ulu ʻana o nā ʻiʻo pili e like me ka ʻili, nā kīʻaha koko, nā iwi, nā tendons, nā niho, a me ka cartilage i nā kānaka a me nā holoholona.