modafinil

As a species, we´ve hit the bedtime barrier. You can eat at your desk, socialize in the break room, and answer text messages on a date, but sooner or later, you´re going to have to sleep. â€After 18, 19 hours awake, your brain function starts to fail,†says Dallas, Texas, sleep-medicine specialist Andrew O. Jamieson. Coffee might keep you up, â€but you´re not going to be focused.â€

Ginkgo biloba

The Brain Claims:
Extract of the ginkgo tree has been used in Asia to treat all manner of physical and mental ailments for at least 1,000 years. The foul-smelling ginkgo—at 200 million years old, its the oldest living species of tree on Earth—is also purported to improve circulation in the brain, supposedly improving cognitive functioning and helping prevent neuron decay.