The best way to build up the adrenals is with natural vitamin C, pantothenic acid, and adaptogenic herbs. Some of the best adaptogenic herbs include schisandra berry, licorice root, astragalus, Siberian ginseng, jiaogulan, and ashwagandha. Nettle leaf and amla berry are also excelelnt for the adrenals.
Try to avoid stress as much as possible. Also stay away from pharmaceutical steroids and all stimulants like caffeine and nicotine. Keep in mind that caffeine can be found in many hidden sources including aspirin, kola nut (bissy nut) and guarana (extremely high).