Extended use of glandulars are not recommended, as they will, as you asked, cause the glands to atrophy. Taking one bottle should not be a problem. It's just that if the body is receiving the needed hormone, it will not produce it.
To help adrenal fatigue, you should take vitamin C and pantothenic acid (vitamin b5). Those are the most important and most required nutrients of the adrenal glands. Along with that, you should take an adaptogen. Search this site for adaptogens. Ashwaganda is a good one as it will also help the thyroid. Schisandra is my second favorite. Without an adaptogen, the VitC and B will not help as well as they can. Check this info also..
https://www.chiro.org/nutrition/FULL/...ic_Herbs.shtml