I have recently been using camphor and vedgetable glyserine to increase my blood circulation in my brains and I think it is effective. It is an old medicine but it works.

wow holy crap -i remember camphor from the oregon trail games - but for treating colds. how does it work?

I think it works fine. I also take liquorice with it. And Omega-3. That is good.

It seems it has some binding affinity for D1 dopamine receptors from what I see in PubMed but any theraputic potential or necessary quantites remain unclear.