Ko ngā kōtare parakirihou e hangaia ana i ngā rinoi moana e whakarereke ana i te ahumahi huarau, ina heke mai hoki te mātauranga taiao ki te hunga nui ake. Kei roto ngā kōtare parakirihou i ngā vitamini me ngā minerara hei whakapai ake i te kounga o te oneone, hei āki ai hoki i te tipu hou, hauora hoki. Ko te nui ake o te whakapai ake i te hua, ko te nui ake o ngā painga taiao me ngā painga ōhanga. Ka pai ake te hua o ngā kaiwhakatuu ki te parakirihou e tukuna mai ana, nā te piki haere o te hiahia ki ngā tikanga e mau ana ki te taiao.