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If it is all so dopamine related, why don't they just give people dopamine? I take it that it is much more complicated than just dopaminergic reactions at play here?

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One big reason is because dopamine does not cross the blood brain barrier... you can't just give it to someone and have it end up in the brain.

Deprenyl works by inhibiting the chemicals in the brain that break down dopamine. The result is higher concentrations. The effect is sustainable.

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