Alpha-GPC (alpha-glycerophosphocholine)
Cognitive · Choline precursor
Tier B+
Bottom line
Read Off Label grades Alpha-GPC (alpha-glycerophosphocholine) as B+ (7.1/10) based on moderate evidence, med benefit magnitude, and a low-risk safety profile.
Most bioavailable choline source per mg.
Studied, labeled, or reported-use context: 300-1200 mg/day PO divided — OTC (US); Rx in some EU countries; not individualized guidance.
If you were testing this on yourself
Two properties decide whether an n-of-1 experiment is readable and recoverable. These describe the experiment — they are not a judgment about whether to run it, and nothing here is a recommendation.
Can you undo it?
Reverses on stopping
Reversible, no accumulation or withdrawal at typical doses.
Can you tell if it worked?
Readable — Acute, 1–2 hours
Subjective focus, or a repeatable timed cognitive task if you want something objective.
What would fool you Cognitive self-assessment is close to worthless unblinded — people reliably report improvement on inert capsules. Without a self-blinding setup and a timed task, this experiment cannot produce a trustworthy answer.
What the evidence says
Most bioavailable choline source per mg. De Jesus Moreno 2003 in mild-to-moderate AD showed MMSE benefit over 180 days. Bellar 2015 showed acute power output increase pre-exercise. Some observational data link supplemental choline to elevated stroke risk via TMAO — controversial.
Mechanism
Bioavailable choline source crossing BBB efficiently; rapidly cleaved to choline (ACh precursor) and glycerophosphate (membrane phospholipid substrate)
Studied, labeled, or reported dose & route
300-1200 mg/day PO divided
This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.
Citations
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Common questions
- What does the evidence show about Alpha-GPC (alpha-glycerophosphocholine)'s effects?
- Read Off Label rates the evidence for Alpha-GPC (alpha-glycerophosphocholine) as Moderate and the benefit magnitude as med, producing an overall grade of B+ (7.1/10). Most bioavailable choline source per mg.
- What safety findings are reported for Alpha-GPC (alpha-glycerophosphocholine)?
- Alpha-GPC (alpha-glycerophosphocholine) has a low risk profile in the database. Low (possible GI/headache); emerging observational signal for stroke risk (inconsistent) Legal status: OTC (US); Rx in some EU countries.
- What doses or routes are reported for Alpha-GPC (alpha-glycerophosphocholine)?
- 300-1200 mg/day PO divided This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
- How does Alpha-GPC (alpha-glycerophosphocholine) work?
- Bioavailable choline source crossing BBB efficiently; rapidly cleaved to choline (ACh precursor) and glycerophosphate (membrane phospholipid substrate)
This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.