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Alpha-GPC
Alpha-GPC is a choline-containing compound found in nature1 with nootropic effects. It serves as a precursor to acetylcholine2 and easily traverses the blood-brain barrier2. Structurally, it combines a choline group with glycerol through a phosphate group1. It has been investigated for the treatment of Alzheimer’s disease and other forms of dementia2.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Duration
Subjective Effects
Pharmacology
Pharmacodynamics
Alpha-GPC is a biosynthetic precursor of acetylcholine3 that rapidly delivers choline to the brain across the blood–brain barrier. It breaks down into choline and glycerophosphate; choline supports acetylcholine synthesis, cholinergic neurotransmission, and cell-membrane signaling, while glycerophosphate may contribute to membrane production, although this role remains poorly understood. Alpha-GPC has also been described as a suspected monoaminergic substance, but this mechanism is uncertain4.
Pharmacokinetics
Alpha-GPC is orally supplementable and rapidly delivers choline to the brain. It is broken down into choline and glycerophosphate. One proposed gastrointestinal pathway involves conversion to trimethylamine, followed by hepatic conversion to trimethylamine N-oxide, although this explanation comes from observational research and remains uncertain.
Interactions
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Harm Potential
Addiction & Dependence
Psychological
Higher doses may increase adverse effects, including possible addiction-related concerns, but Alpha-GPC-specific addiction risk has not been characterized.
Toxicity
A large retrospective cohort study associated alpha-GPC use with higher stroke risk, though a later meta-analysis criticized the statistics.
Headaches are listed among physical side effects.
Teeth grinding is listed among physical side effects.
Body odor alteration may occur in susceptible populations, especially people with trimethylaminuria.
History & Culture
Alpha-GPC has been used by some athletes as a supplement, motivated by claims that it may increase growth hormone production and power output; the latter was supported by a single pilot study involving 600 mg before exercise. Alpha-GPC was investigated in a multicentre, randomised, controlled study involving patients with probable Alzheimer's-type senile dementia of mild to moderate severity5.
Legality
By Country
CanadaLegal (regulated)
United StatesNot scheduled
Article Status
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