Alpha-GPC

Superior choline source that crosses the blood-brain barrier efficiently, supporting acetylcholine production and cognitive function

Scientific nameAlpha-glycerophosphocholine FormulaC8H20NO6P Molecular weight257.22 g/mol CAS28319-77-9

85 absorption score

9 safety / 10

40 USD per month

5 documented interactions

Check it against something

Evidence level B

Alpha-GPC with:

78 out of 100

Works better together Compatible. Timing differs, so follow each supplement's own window.

Check it against your whole stack →

What it does

mechanism and evidence for each claim

Enhanced memory and learning

Significantly improves memory formation and recall

Increases acetylcholine production for memory consolidation Evidence A-grade 1-4 weeks

Neuroprotective effects

Protects brain cells from damage and supports healthy aging

Maintains cell membrane integrity and supports neuroplasticity Evidence A-grade 4-12 weeks

Improved focus and attention

Enhances concentration and cognitive performance

Acetylcholine enhancement improves attention and focus Evidence B-grade 1-3 weeks

Athletic performance enhancement

May improve power output and growth hormone release

Supports neuromuscular function and hormone production Evidence B-grade 45-90 minutes pre-workout

Alzheimer's disease support

May slow cognitive decline in neurodegenerative diseases

Supports cholinergic function and neural membrane health Evidence A-grade 12-24 weeks

Others take these for the same thing

Same goal, different mechanism — check any of them against this one

Vitamin B12 (Cyanocobalamin) Energy & nerve support 250-1000 mcg A 70% Fish Oil (EPA/DHA) Heart & brain health 1-2g EPA/DHA A 85% L-Theanine Calm focus & stress relief 100-400mg B 90% Vitamin B8 (Inositol) Mental health & PCOS support 2-18g (condition dependent) B 95% SAM-e Mood support & liver health 400-800mg A 70% Lithium Orotate Mood & brain support 1-20mg C 60%

Every pair we checked

12 combinations scored by the engine

Alpha-GPC + Caffeine No documented interaction either way No known interaction 70

Alpha-GPC + Creatine Monohydrate No documented interaction either way No known interaction 70

Alpha-GPC + Calcium Carbonate No documented interaction either way No known interaction 70

Alpha-GPC + Whey Protein No documented interaction either way No known interaction 70

Alpha-GPC + Lactase No documented interaction either way No known interaction 70

Alpha-GPC + Bovine Collagen No documented interaction either way No known interaction 70

Alpha-GPC + DHA No documented interaction either way No known interaction 70

Alpha-GPC + Turmeric No documented interaction either way No known interaction 70

Alpha-GPC + Fish Oil (EPA/DHA) No documented interaction either way No known interaction 70

Alpha-GPC + Phosphatidylserine Enhanced memory and cognitive function Works better together 78

Alpha-GPC + Omega-3 + Curcumin + Vitamin D Triple Anti-Inflammatory Formula Enhanced brain health and neuroprotection Works better together 78

Alpha-GPC + Vitamin D3 Enhanced acetylcholine synthesis Works better together 78

Dosage

Morning with food

Daily300-600mg

Cognitive enhancement300-600mg daily

Neuroprotection300-600mg daily

Alzheimers support400-1200mg daily

Athletic performance300-600mg pre-workout

Upper limit 3500 mg NIH ODS

When to expect it

First Effects1-2 weeks for cognitive benefits

Peak Benefits4-8 weeks for sustained memory and neuroprotection

Deficiency DevelopmentWeeks to months with inadequate choline intake

Toxicity OnsetRare, mainly digestive upset with high doses

How to measure it

$100-200

MarkerCholine levels, acetylcholine activity

OptimalAdequate choline status

Deficient belowLow choline levels

FrequencyOnly if monitoring choline status

What people actually reported to the FDA

CAERS, 5 reports naming it as the suspect

Most reported effects

Cough 1

Rhinorrhoea 1

Headache 1

Cerebrovascular accident 1

Paralysis 1

Named as the suspect 5 reports of 6 that mention it at all

Serious outcome 80% hospitalisation, emergency room or worse

Other Serious or Important Medical Event4

Visited a Health Care Provider2

Hospitalization2

Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →

What actually reaches you

The label counts the carrier, your body does not

Absorption Very high 85 of 100 · best absorbed form of this compound

Delivered daily 382.5 mg

Cost per 100 mg delivered $0.35 comparative — uses the absorption score, not a measured percentage

Works better with

3 documented

Phosphatidylserine

Enhanced memory and cognitive function

Both support neural membrane function · level B

Omega 3 Fatty Acids

Enhanced brain health and neuroprotection

Complementary membrane support and anti-inflammatory effects · level B

B Complex Vitamins

Enhanced acetylcholine synthesis

B-vitamins support neurotransmitter production · level B

What not to take with Alpha-GPC

2 documented

Alcohol

Alcohol interferes with choline metabolism

Depletes choline stores and impairs acetylcholine function · moderate significance

Anticholinergic Drugs

May counteract cognitive benefits

Blocks acetylcholine receptors · major significance

Medication interactions

Discuss these with a pharmacist before combining

cholinesterase-inhibitors Minor

May enhance drug effects

What to do: Monitor for enhanced effects

anticholinergics Minor

May reduce drug effectiveness

What to do: Monitor drug effectiveness

scopolamine Minor

May counteract scopolamine effects

What to do: May reduce drug effectiveness

Available forms

bioavailability compared

Alpha-GPC (L-Alpha-glycerophosphocholine) 85

Alpha-GPC (L-Alpha-glycerophosphocholine): Excellent brain penetration, Strong research, Memory enhancement, Neuroprotective

Food sources

before you supplement

Egg yolks Small amounts naturally · 50

Organ meats Small amounts naturally · 50

Soy lecithin Trace amounts · 30

Supplements only for therapeutic doses 300-600mg per capsule · 85

Too little

deficiency signs

Poor memory and cognitive function
Difficulty concentrating
Reduced learning capacity
Mood changes and irritability
Muscle weakness
Fatty liver (severe choline deficiency)
Accelerated brain aging

Too much

toxicity signs

Generally very safe, potential effects:
Nausea and digestive upset
Headaches and dizziness
Insomnia if taken late
Fishy body odor (rare)
Excessive sweating (rare)

Who benefits most

memory-cognitive-enhancement

Excellent for improving memory and cognitive performance

300-600mg daily

aging-neuroprotection

Supports healthy brain aging and prevents cognitive decline

300-600mg daily

alzheimers-dementia

May slow progression of neurodegenerative diseases

400-1200mg daily

students-learning

Enhances learning capacity and memory formation

300-600mg daily

athletes-performance

May improve power output and growth hormone release

300-600mg pre-workout

Where to buy it

compare forms first

Look for Alpha-GPC at 300-600mg per serving. The form that matters here is Alpha-GPC (L-Alpha-glycerophosphocholine).

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What else affects it

Beyond other supplements

Alcohol

Alcohol interferes with choline metabolism

Depletes choline stores and impairs acetylcholine function

How it works

Rapidly converts to acetylcholine in the brain
Crosses blood-brain barrier efficiently
Supports phospholipid synthesis for cell membranes
Enhances cholinergic neurotransmission
Stimulates growth hormone release
Supports neuroplasticity and memory formation

Key findings

what the evidence supports

Strong evidence for memory enhancement and cognitive function
Excellent research on Alzheimer's disease and dementia
Superior bioavailability compared to other choline sources
Generally safe with good tolerance profile

Sources: NIH Examine.com · data reviewed 2026-08-02

Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →

Common questions

What are the benefits of Alpha-GPC?

Documented effects: Enhanced memory and learning; Neuroprotective effects; Improved focus and attention; Athletic performance enhancement. Significantly improves memory formation and recall

How much Alpha-GPC should you take per day?

The common daily range is 300-600mg. By goal — cognitive enhancement: 300-600mg daily; neuroprotection: 300-600mg daily; alzheimers support: 400-1200mg daily; athletic performance: 300-600mg pre-workout.

When is the best time to take Alpha-GPC?

Morning with food. First effects are typically reported within 1-2 weeks for cognitive benefits.

What are the side effects of Alpha-GPC?

At excessive doses: Generally very safe, potential effects:, Nausea and digestive upset, Headaches and dizziness, Insomnia if taken late, Fishy body odor (rare). Safety rating at normal doses is 9 out of 10.

What should you not take with Alpha-GPC?

Separate it from Alcohol, Anticholinergic Drugs by two to four hours. Alcohol interferes with choline metabolism

Does Alpha-GPC interact with medications?

Documented interactions with cholinesterase-inhibitors, anticholinergics, scopolamine. Discuss these with a pharmacist before combining.

How much Alpha-GPC is too much?

The tolerable upper intake level is 3500 mg per day for adults, per NIH ODS. Above that, the risk of adverse effects rises: Generally very safe, potential effects:, Nausea and digestive upset, Headaches and dizziness.

How do you know if you need Alpha-GPC?

The marker is Choline levels, acetylcholine activity, optimal range Adequate choline status. Common deficiency signs: Poor memory and cognitive function, Difficulty concentrating, Reduced learning capacity, Mood changes and irritability.

Taken for

52 Brain & Focus

Caffeine · DHA · Fish Oil (EPA/DHA)