Supplement Scholar
Compound

Huperzine A

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Huperzine A. Acetylcholinesterase inhibitor from club moss — potent cholinergic enhancer.

How it works. Reversibly inhibits AChE, raising synaptic acetylcholine; mild NMDA antagonist.

What the research supports. 1 graded claims. Strongest: Improves cognition in Alzheimer's (Chinese trials) (moderate).

How much to take. Typical dose: 50–200 mcg cycled (e.g. 5 days on/2 off).

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Omega-3 (EPA/DHA), Alpha-GPC or CDP-choline.

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Huperzine A. Anecdotes are not medical advice.

Huperzine A. Acetylcholinesterase inhibitor from club moss — potent cholinergic enhancer.

Molecular structureC15H18N2O · 242.32 g/mol

What it is

Acetylcholinesterase inhibitor from club moss — potent cholinergic enhancer.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

Goals

MemoryFocusCognitive PerformanceBrain & Cognitive

How it works

Reversibly inhibits AChE, raising synaptic acetylcholine; mild NMDA antagonist.

Pathways

  • Reversibly inhibits AChE, raising synaptic acetylcholine
  • mild NMDA antagonist

Effects

  • +cognition in Alzheimer's (Chinese trials) supports

What the research supports

Improves cognition in Alzheimer's (Chinese trials)moderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
50–200 mcg cycled (e.g. 5 days on/2 off)
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodOptional
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • GI upset
  • Vivid dreams

Medication interactions

Cholinergic drugsmoderate

Additive.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Omega-3 (EPA/DHA)Membrane fluidity and neuronal signaling support.
  • Alpha-GPC or CDP-cholineProvides choline substrate for acetylcholine synthesis.

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

Huperzine A for Alzheimer's disease ↗
Meta-analysis · PLoS One · 2013

Improvements in MMSE and ADL scores.

PubMed: Huperzine A — Improves cognition in Alzheimer's ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Huperzine A and "Improves cognition in Alzheimer's". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Huperzine A — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Huperzine A and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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