Does it work?

• Huperzine A acts as a cholinesterase inhibitor — a group of medications that work by improving the levels of neurotransmitters in the brain.
• Small early studies suggest that huperzine A may improve memory and protect nerve cells, which could slow the cognitive decline associated with Alzheimer's.
• More studies are needed, however, to determine possible benefits and long-term risks of huperzine A.

Dangers and possible side effects:

• For now, most doctors don't recommend taking huperzine A because approved cholinesterase inhibitor medications are available that have been tested for safety and effectiveness.
• It is recommended that you not take huperzine A if you're already taking a prescribed cholinesterase inhibitor, such as donepezil (Aricept), rivastigmine (Exelon) or galantamine (Reminyl).
• Taking both could cause side effects, such as nausea, vomiting, diarrhoea, dizziness and muscle cramps.

References:

1. Natural Standard- The Authority on Integrative Medicines