Effect of Glycyrrhizic acid on serum cortisol, ACTH, and CRH Concentration in adrenal insufficiency in rats. Control negative: received normal saline, control positive: hydrocortisone, Therapeutic: received hydrocortisone then Glycyrrhizic acid, Protective: received hydrocortisone with Glycyrrhizic acid, Glycyrrhizic Acid: Glycyrrhizic acid only.