Of course I am not taking any adrenal axtracts, just the nutrients that Wilson recommends: He doesn't advise taking adrenal extracts except as a last resort.
The article you cited doesn't cite any actual studies, it just says "A study found", rather vaguely. (Perhaps because it's written by psychologists - so far everything I have ever read or heard said by a psychologist was garbage!!!)
Anyway, I found a scientific paper published by the NIH from the US national library of medicine reporting on the effects of vitamin C infusion upon endogenous cortisol production.
http://www.ncbi.nlm.nih.gov/pubmed/7772741
The article says:
Results obtained are as follows: 1) the practice of the steroid-free vitamin C infusion treatment induced a) distinct depletion of both cortisol and vitamin C from the circulation at the initial to moderate stages of the experiment, b) a small surge of plasma cortisol at the middle stage, and c) skyrocket-like rises of ACTH and cortisol of plasma at the terminal stage.
So I think this means that we are both right, except that what I am doing is remaining in the terminal "skyrocket" stage by taking vitamin C continuously. Well, my blood tests are showing that result, so that must be the case.
And here's the Dr Lam website which gathers a lot of the scientific research on the whole Adrenal fatigue issue:
http://www.drlam.com/