Yawancin sunadaran da ke aiki a cikin jiki an samo su daga collagen, wanda kuma yana da mahimmanci ga fata, tsoka, da kashi. Glycine, proline, hydroxyproline, da sauran amino acid suna da yawa a jikin mutum. Yana da mahimmanci don haɓakar kyallen takarda kamar fata, tasoshin jini, ƙasusuwa, tendons, hakora, da guringuntsi a cikin mutane da dabbobi.