Huperzine-A (Noitol)
Huperzine-A is a potent inhibitor of the enzyme that disposes of acetylcholine in the brain and elevates acetylcholine levels. It is an alkaloid found in Huperzia serrata, a plant used in traditional Chinese medicine.

In clinical studies, huperzine showed memory-enhancement in animals and in humans. Users report increased alertness, short- and long-term memory retention, and energy.

Dosage:The recommended dosage for Huperzine-A ranges from 200-400 micrograms.
Precautions: Not recommended for pregnant women or nursing mothers.