Huperzine A is extracted from Huperzia serrata. It is a reversible acetylcholinesterase inhibitor and NMDA receptor antagonist that crosses the blood-brain barrier.The structure of the complex of huperzine A with acetylcholinesterase has been determined by X-ray crystallography 

[ Molecular formula] C15H18N2O
[ Plant origin] Huperzina serrata(Thumb.)Trev
[ Active ingredients] Huperzine A, Huperzine B
[Character] Yellow brown to off white powder
[ Test method] HPLC ( ChromaDex standard reference )
[Specification] Huperzine A 1%
　　　　　　　Huperzine A 5%
　　　　　　　Huperzine A 98%
　　　　　　　Huperzine (A + B)
　　　　　　　Water soluble huperzine A.
　　　　　　　Pure white huperzine A 1% proceeded from 99% huperzine A
[Advantage] No EDC or other toxic solvent residue
　　　　　　Heavy metals ≤ 10ppm, special Pb ≤ 2ppm.