Alpha-GPC

Supplements · Nootropics · Supplement, Typed Supps

A choline compound that reaches your brain well — but a large study links regular use to more strokes.

Stage by stage

Intake (Capsule): Absorbed efficiently in the small intestine.
Small intestine (Efficient absorption): Absorbed more efficiently than many choline sources.
Bloodstream (Crosses into the brain): Crosses into the brain more readily than many choline sources.
Acetylcholine (Memory & muscle signalling): Used to build acetylcholine, a neurotransmitter involved in memory and muscle signalling.

What the evidence supports

Improving cognition in dementia or vascular cognitive impairment, usually alongside a drug — limited evidence. Older Italian trials and the ASCOMALVA study suggest benefit mostly as an add-on to a prescription drug; the studies have methodological limits.
Boosting power output and growth-hormone response acutely in athletes — limited evidence. A few small acute-dose trials show modest effects on lower-body power and hormone response around 60–90 minutes after a dose.
Enhancing cognition in healthy adults — insufficient evidence. Direct evidence in healthy people is thin, and most positive data come from impaired populations.
Evidence that it causes Raising 10-year stroke risk — moderate evidence. A large Korean cohort found a dose-dependent, roughly 46% higher incident stroke risk in users. This is an observational association, not proof of cause, but it is a substantial signal.

Typical dose

300–600 mg per dose; dementia trials used up to 1200 mg/day

Upper limit: No established UL

Timing

With food, standard dosing.

Time to effect

~1 hr: Circulating choline levels rise; cognitive effects vary.

Medication interactions

Anticholinergic medications: Its cholinergic action may work against anticholinergic drugs. (moderate)

Common myth

“Alpha-GPC is essentially a stimulant.” In reality: It’s not stimulating like caffeine — its studied effects relate to choline availability for neurotransmitter production.