After 10g or so, the excess starts going to the brain which helps quite a bit with brain energy.

What exactly does it do? What is brain energy?

A good question, but we don't know what anti-depressants do or how they do it, same with anti-psychotics, mood stabilizers, psychedelics, etc. I think we can say we have good theories for creatine.

We do know that it does do something at certain doses.

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