What tests were run to show low dopamine? I had a neurologist tell me based on some simple neurological test I had PD which turned out to be hogwash. If the tyrosine is causing brain glow then I am not aware of any other mechanism than DA production which needs bh4. So not sure what else to say. Increased inflammation during allergy season will make neopterin rise thereby slowing production of bh4.
Also there is a correlation between sex hormones and diabetes but the association is not strong and it is low testosterone is absolutely NOT causative of diabetes. Some researchers floated hormonal causes years ago and they ended up being debunked completely. Correlation is causation. Dhea is very protective of many things and is an important element. Women benefit also due to an indirect peogesterone shunt. Men due improved testosterone to estradiol ratio. I take 150 mg myself a day with my doctor's blessing. But dhea while it may provide the missing sex hormones is not in the same class as the big hormones like cortisol, thyroid, and aldosterone. For some if us those big three have mammoth implications.
In my own case treating my autoimmune disease head on and lowering inflammation has massively reduced my allergies. Going from I could not walk outside with pollen and can't step into a drugstore without the chemicals and fragrances crushing me. Now at worst I take a 12 hour allegra at night during the spring.
Heh I don't mind the mortal part if life would quit piling on my health