My apologies for the snarky critique - I honestly didn't intend to offend. BPS makes good products at good prices, so the explanation is confusing.
"While the basis for this extract is largely based on volumes of feedback from functional medicine practitioners versus published data"
A host of studies are listed for every other ingredient. Not that this product is expensive, or adrenal extract is, but one would think you'd save a couple pennies by leaving out an ingredient of dubious utility. Even the inclusion of ingredients like tribulus, for example, in supplements is based mostly on anecdotal evidence from what I've seen, but at least there's supporting studies for it. They indicate that someone somewhere reported that it did something, but nobody actually knows what or how - compounding the confusion further would be combined feedback from dessicated gland and a variety of extracts. While I doubt it's harmful as some websites seem to indicate, I've found it to be useless for me and think it waters down a product full of thoroughly researched ingredients. I simply don't get the impression the product would be any less effective without the adrenal extract without knowing more about it.