I think your doctor is wrong about this.  Visit www.drhotze.com (hope this is right spelling.)  It's supposed to remind your body of how to release the hormones.  It will not stop production after you stop supplementing.   In the case of adrenal fatigue, supplementing with Cortef gives your adrenal glands a rest.  They have become over worked and can no longer produce cortisol or are approaching cortisol depletion.  When you are recovered from the stress that caused the depletion your adrenals will be capable of responding properly once again..I'm certain the other hormones work this way too, just make sure you don't stop supplementing too soon.  The drugs would cause problems like that but not the bio-identicals.