Everything everyone else said is correct but they haven't addressed the pheochromocytoma question yet. Simply it doesn't secrete dopamine at all, it secretes adrenaline and noradrenaline so wouldn't affect Parkinson's even if the blood brain barrier wasn't an issue.
Turtle2727 t1_j2381yr wrote
Reply to In Parkinson disease, why doesn't the adrenal gland fill the dopamine deficiency? by Actual-Pumpkin1567
Everything everyone else said is correct but they haven't addressed the pheochromocytoma question yet. Simply it doesn't secrete dopamine at all, it secretes adrenaline and noradrenaline so wouldn't affect Parkinson's even if the blood brain barrier wasn't an issue.