HYPER-thyroidism causes elevated levels of 5-AR derived androgens like DHT. Hyperthyroid people are known to almost never go bald, even well into their 80s. If DHT was the cause, it would have manifested itself in that population. But I fully agree with you that it is long overdue to have an actual trial with DHT. However, I am pretty sure it would be deemed unethical and thus won't happen in the USA at least.
Balding is undeniably linked to adrenal hyperactivity, and while this may result in local excess of DHT from the surge in DHEA produced by the adrenals, to blame DHT without taking the account the systemically elevated prolactin, cortisol, estrogen, serotonin, and histamine is cherry-picking. So, the currently correct statement would be that DHT is one among MANY of the steroids found elevated in bald people and DHT itself is actually only elevated in a small sub-population of the balding people. People with high DHT and T but normal DHEA, cortisol, prolactin, etc do NOT go bald. High serum T and DHT are symptoms of good testicular function and thus good metabolism. When the adrenals kick into overdrive to compensate for the low metabolism that is when things go bad.
Hypothyroidism (Cortisol, Prolactin And Adrenal Hyperactivity) Causes Balding
Effects of thyroid hormone on steroid metabolism
Excellent post. I don't think low metabolism is a main reason why adrenals kick in the way they do though, because obese people bald even less in general and even some diabetics have perfect hair throughout their lives (they basically are the definition of low metabolism), schizophrenics (low brain metabolism?), celebrity hypothyroid people like Ronaldo, and there's a lot of super-athletic, muscle freak people, or skinny guys that go bald yet they probably don't have a problem with metabolism. Estrogen, histamine, glutamic acid etc when elevated seem to be the main reasons adrenals kick in much higher. Can also be from someone's mentality or traumatisms where his adrenal response to stresses is much greater than other people, I think this part is important because even if some things aren't right in your body, you can still mindfully limit or promote adrenaline a lot.