Pyritinol

Pyritinol (or Pyrithioxin) is a strong synthetic antioxidant and nootropic. Chemically, it is related to vitamin B6 compounds, such as pyridoxine. . It increases the brain's electrical firing rate and boosts glucose metabolism.

One small study with 12 subjects given pyritinol showed an improvement in performance on tests of reaction time, but not on memory tests.