Submitted by Actual-Pumpkin1567 t3_zxsbm7 in askscience
aTacoParty t1_j23yo3w wrote
Reply to comment by Turtle2727 in In Parkinson disease, why doesn't the adrenal gland fill the dopamine deficiency? by Actual-Pumpkin1567
It's very rare but possible. The majority of peripheral dopamine comes from peripheral sympathetic nerves which in part use dopamine to communicate. Some of this dopamine is taken up in the blood stream. Interestingly, there's almost as much dopamine in your blood as adrenaline though what it's doing there is not really known.
https://academic.oup.com/endo/article/151/12/5570/2456083?login=true
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