Alpha-GPC
Also known as L-Alpha glycerylphosphorylcholine, Choline alfoscerate, Alpha-glycerophosphocholine
Alpha-GPC is a choline-containing compound that crosses the blood-brain barrier efficiently and raises acetylcholine, a neurotransmitter central to learning, memory, and muscle contraction. It is studied for cognition in older adults and after stroke, and is popular pre-workout for supporting power output. Evidence is moderate for cognition and preliminary for performance.
Benefits
Supports memory and attention
ModerateAs a choline donor it raises acetylcholine, a neurotransmitter central to learning and memory.
May boost power output
PreliminaryAcute dosing before training has increased lower-body power in small studies.
Highly bioavailable choline source
ModerateDelivers a high percentage of choline by weight and crosses the blood-brain barrier efficiently.
Pros & cons
Pros
- Highly bioavailable choline source
- May support memory and power output
- Crosses the blood-brain barrier well
Cons
- Can cause headaches in some users
- A preliminary study raised a possible stroke-risk signal
- Benefits in healthy young adults are less certain
Side effects
Headache or GI upset
Some people report headaches, nausea, or heartburn, usually at higher doses.
Possible cardiovascular signal
One observational analysis linked high choline intake from alpha-GPC to stroke risk; this is preliminary and not established.
How to take it
Typical dose
300–600 mg per day (often 300 mg pre-workout)
Timing
With or without food; pre-workout for power output or in the morning for focus
Common forms
Tip: Standardized products list elemental alpha-GPC content. Avoid late-day dosing if it disrupts sleep.
What the research says
Alpha-GPC and cognition
ModerateTrials in older adults and after stroke suggest alpha-GPC may support memory and attention; data in healthy young adults is more limited.
Alpha-GPC and power output
PreliminarySmall studies report increases in lower-body power and force after acute alpha-GPC dosing.
How Alpha-GPC interacts
Synergies, absorption effects, and cautions between Alpha-GPC and other supplements in the matrix.
Both are bioavailable choline sources that raise acetylcholine; alpha-GPC delivers more choline by weight while citicoline also provides cytidine for membrane synthesis.
Compare the pairingA classic cholinergic stack: alpha-GPC supplies the choline to build acetylcholine while huperzine A slows its breakdown.
Compare the pairingCommonly paired pre-workout and in focus stacks; alpha-GPC supports power output and acetylcholine while caffeine adds stimulation.
Compare the pairingOften combined in focus formulas, pairing a choline source with a dopamine precursor for attention under demand.
Compare the pairingBoth supply phospholipid and choline building blocks that support membranes and cholinergic signaling for cognition.
Compare the pairingFrequently asked questions
What is Alpha-GPC used for?
Alpha-GPC is most commonly used for focus, brain health, and performance. As a choline donor it raises acetylcholine, a neurotransmitter central to learning and memory.
How much Alpha-GPC should I take?
A typical dose is 300–600 mg per day (often 300 mg pre-workout). Standardized products list elemental alpha-GPC content. Avoid late-day dosing if it disrupts sleep. Start at the lower end and confirm the right dose for you with a healthcare professional.
When is the best time to take Alpha-GPC?
Recommended timing: With or without food; pre-workout for power output or in the morning for focus.
What are the side effects of Alpha-GPC?
Reported side effects include headache or gi upset and possible cardiovascular signal. Some people report headaches, nausea, or heartburn, usually at higher doses.
Who should be careful with Alpha-GPC?
A preliminary study associated high alpha-GPC choline intake with increased stroke risk; discuss with a doctor if you have cardiovascular risk factors. Speak with a healthcare professional if any of these apply to you.
Important cautions
- A preliminary study associated high alpha-GPC choline intake with increased stroke risk; discuss with a doctor if you have cardiovascular risk factors.
- Avoid late-day dosing if it disrupts sleep.
- Not well studied in pregnancy.
More Nootropics
Caffeine
The world's most popular cognitive stimulant.
Citicoline
A choline source studied for focus, memory, and brain health.
Huperzine A
A plant alkaloid that slows acetylcholine breakdown for memory.
Compare Alpha-GPC with
Weighing your options? See how Alpha-GPC stacks up against similar supplements.