"The adrenals aren't failing, as in Addison's. They aren't destroyed as in an autoimmune issue. They simply can't keep up with the demands placed on them," said James Wilson, an Arizona-based naturopath and chiropractor who coined the term in 1998 and has written what some call the definitive guide for patients.
Sound like he's even saying adrenals don't fatigue. I hope we can all then agree that supplements intended to "rebuild" the adrenal glands are a waste of money.