It's exactly what I referred to in my earlier post.... May be one day. Keep up the hopes.
The blood-brain barrier in the brain that is keeping us safe from bacteria, viruses other particles entering the brain. Only a few molecules are allowed, like Oxygen and carbon-dioxide. (But note Meningitis bacteria is able to trick the barrier and enter the brain)
There's is growing evidence that the disruption of this barrier is the cause of some brain related diseases including Parkinson's.
Dopamine itself cannot cross the barrier, but Syndopa/Levodopa is able to get into the brain and the nerve cells then convert this to dopamine. That's how this works.
As I said before there's no permanent cure yet, still even hasn't found out how the disease is onset.
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