When selecting adrenal glandulars you have to consider which portion requires support.
The adrenal cortex is often the place to start. People who have issues with anxiety and panic won't want to start with whole adrenal extract. That contains adrenal medulla, the portion involved in production of adrenaline-like chemicals.
Of course there are a few people like me with inattentive ADD that benefit from more adrenaline and related chemicals. That can help with motivation.