A, an alkaloid isolated from the Chinese herb Huperzia serrata (Lycopodiaceae), is a reversible, potent and selective AChE inhibitor with a longer duration of action and the ability to cross the blood-brain barrier.
A protects C6 rat glioma cells against oxygen-glucose deprivation-induced injury.
A attenuates cognitive dysfunction and neuronal degeneration caused by [beta]-amyloid protein (1 -40) in rats.
A and the lipoic acid results require some explanation.
The lycopodium alkaloid huperzine
A  related to the quinolizidines, is a potent, yet reversible, inhibitor of AChE and is used in China for treating patients with myasthenia gravis and AD.
A, a lycopodium alkaloid isolated from Huperzia serrata, has been shown to reduce neuronal cell death caused by oxidative stress (Xiao et al.
Memory Formula contains turmeric acid and huperzine
saururus containing huperzine
A (selagine) (Ayer et al.