Huperzine A is a compound extracted from Huperziceae herbs, and is known as a potent acetylcholinesterase inhibitor. When taken, Huperzine A supports relative levels of acetylcholine by inhibiting enzymes that cause its degradation. Acetylcholine plays an important role in many cognitive processes including memory, intelligence, and mood. For this reason, Huperzine A may help support overall cognitive performance and brain health.