The $5 Brain Hack That's Quietly Outperforming Fancy Nootropic Stacks
While the nootropic industry keeps pushing $200 bottles of 14-ingredient blends, a two-supplement combo costing less than a latte has been quietly winning in clinical research for decades. Caffeine and L-theanine together do something neither can pull off alone — and the science is surprisingly convincing. Here's what you actually need to know before spending another dollar on fancy brain supplements.