Alpha-GPC
Choline source supporting acetylcholine synthesis and power output.
By Suplagen Team · Updated
What it is
Alpha-GPC (alpha-glycerophosphocholine) is a highly bioavailable choline compound that crosses the blood-brain barrier efficiently.
How it works
Provides choline for acetylcholine synthesis; supports phospholipid membrane integrity and growth hormone secretion.
What the evidence says
Moderate evidence for cognitive support; emerging evidence for power output in athletes.
How much to take
The catalog range is 300 to 600 mg per dose, with a 1,200 mg daily ceiling. The moderate evidence for cognitive support sits in that range, and the emerging power-output data in athletes used similar amounts.
Start at 300 mg. Headaches at higher doses are the classic sign of choline excess, and the fix is less, not more.
When and how to take it
30 to 60 minutes before whatever you need it for: a long block of work or a training session. It's a before-food supplement, so keep it clear of meals.
Store it sealed and dry; Alpha-GPC is hygroscopic and turns to goo in a humid cabinet. Don't stack it with citicoline. The comparison explains why one choline source is enough.
Who should skip it
Two moderate interactions: anticholinergic drugs and cholinesterase inhibitors, both of which act on the same acetylcholine system. Anyone on either needs a doctor's sign-off. No contraindicated conditions are listed, and pregnancy safety isn't established.
Safety Notes
- Hygroscopic — store in cool, dry place. Some people report headache at higher doses (choline excess).
- anticholinergic drugs: May counteract drug effects.
- cholinesterase inhibitors: Additive cholinergic effects; consult physician.
Common questions
What is the right Alpha-GPC dosage?
300 to 600 mg, taken 30 to 60 minutes before demands, with a daily ceiling of 1,200 mg. Start low; a headache means too much choline.
When should I take Alpha-GPC?
Before you need it: 30 to 60 minutes ahead of a work block or a workout, on an empty stomach. It has no role at night.
Alpha-GPC or CDP-choline?
Alpha-GPC for on-demand focus and training days, citicoline for steady daily use with fewer side effects. The full comparison covers both.