Thank you for your answer and your further questioning about my health issues. As I mentioned in my first message, I am dealing with post-traumatic stress disorder. In conjunction with that, one of my biggest challenges is severe fatigue. Sometimes, it just constrains me to bed. I nearly cannot get out of it, and it pushes me down. When I exercise to get into activity again and to stimulate my circulation, afterward, it gets even worse; I am exhausted, not activated. So, in research, because of my struggle with PTSD, I found an article that mentioned decreased cortisol levels in people with PTSD. So, I was curious about my own cortisol level. Therefore I did several tests. I really wonder if low cortisol could be one of the underlying reasons for my fatigue. You wrote about a range from 10 to 100 micrograms. I saw several ranges, which began at 20 micrograms upward. What is a range I can orientate on, and what are the influencing factors? Respective to my medication I can add the following: Fluvoxamine 100 mg (1/d), Pantoprazole 20 mg (1/d). I personally think that 10 to 100 is such a great range and if you are at the bottom of it, could it be that you are at the bottom is primary?