howtosupplement
Cognition

Huperzine-A

Acetylcholinesterase inhibitor from Chinese club moss that may improve cognitive symptoms in dementia; evidence in healthy adults is limited.

Huperzine-A

Huperzine-A

46
score
C
evidence
Caution
risk
Quick Take

Worth considering for age-related cognitive decline; unlikely to enhance cognition in healthy adults.

Huperzine-A is an alkaloid extracted from the Chinese club moss Huperzia serrata. It functions as a potent, reversible acetylcholinesterase inhibitor, increasing acetylcholine levels in the brain. Meta-analyses of randomized trials suggest it can modestly improve cognitive function, daily living activity, and behavioral symptoms in people with Alzheimer's disease and vascular dementia. Evidence for memory enhancement in healthy adults is preliminary and inconsistent. It is also used clinically in some regions for myasthenia gravis.

Proven Benefits

01
Improves cognition in dementia
02
May improve memory in adults
03
May support neuroprotection

Protocol

Amount
200-400 mcg
Frequency
Once or twice daily
When
Morning and/or afternoon; avoid late evening due to potential insomnia from cholinergic stimulation.

Onset Time

2-4 weeks for dementia; acute effects in healthy adults within 1-2 hours.

Who Should Consider

Adults with Alzheimer's or vascular dementia
Individuals with mild cognitive impairment
Those seeking memory support with guidance
Adults avoiding prescription AChE inhibitors

How It Works

Huperzine-A crosses the blood-brain barrier and reversibly inhibits acetylcholinesterase, raising acetylcholine levels in synapses to enhance cholinergic signaling. Preclinical research also suggests modulation of NMDA receptors and increased nerve growth factor expression, though human confirmation of these neuroprotective effects is limited.

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