Sure "it" Can be employed in all of those constructions and Some others, but soem in the illustrations could use adjustments. healthful - conducive to very good health of entire body or brain; "a healthful local weather"; "a healthful environment"; "healthful diet"; "healthful sleep"; "Dickens's relatively healthful exuberance" The FDA https://www.bankerhomeopathicclinic.ca/fees.php