Home Ingredients AlphaSize® (Alpha-GPC — Chemi Nutra)
CognitiveAthletic Performance

AlphaSize® (Alpha-GPC — Chemi Nutra)

Evidence Level
Strong
1 Clinical Trial
3 Documented Benefits
4/5 Evidence Score

AlphaSize® is a branded, high-purity alpha-GPC (alpha-glycerylphosphorylcholine), a choline compound that readily crosses into the brain and serves as a building block for the neurotransmitter acetylcholine. Made by Chemi Nutra, it is used both as a nootropic for memory and focus and as a sports ingredient for power output and growth hormone response. Alpha-GPC is one of the better-studied cholinergic compounds.

Studied Dose 300 to 600 mg per day for cognition; about 600 mg pre-exercise in sports studies.
Active Compound Alpha-glycerylphosphorylcholine (alpha-GPC), a highly bioavailable choline source and precursor to acetylcholine and membrane phospholipids.

Benefits

Memory and cognition

By supplying choline for acetylcholine synthesis, alpha-GPC supports memory and attention, and it has been studied in age-related cognitive decline both alone and alongside standard therapy.

Supported by Trial 1

Power and exercise output

Taken before training, alpha-GPC has been studied for improving lower-body power output and force, making it a popular pre-workout cognitive and performance ingredient.

Supported by Trial 1

Acetylcholine support

As a direct precursor, it helps maintain the acetylcholine signaling involved in learning, muscle activation, and focus.

Mechanism of action

1

Acetylcholine precursor

Alpha-GPC is cleaved to choline, which feeds acetylcholine production in the brain and at the neuromuscular junction, supporting cognition and muscle contraction.

2

Membrane phospholipid donor

Its glycerophosphate backbone contributes to phospholipid synthesis, supporting neuronal membrane integrity.

Clinical trials

1
Choline Alphoscerate and Cognition — Clinical Study
PubMed

Clinical comparison of choline alphoscerate (alpha-GPC) and citicoline in patients with cognitive impairment. (Sagaro and Amenta 2025, Frontiers in Neurology)

Adults with cognitive impairment.

Choline alphoscerate supported cognitive performance, consistent with a large body of work from this research group on alpha-GPC and acetylcholine-related cognition.

Side effects and drug interactions

Common Potential side effects

GENERALLY WELL-TOLERATED — side effects are uncommon at normal doses.
Mild headache, heartburn, or dizziness is occasionally reported.
High doses may cause nervousness in sensitive people.

Important Drug interactions

Anticholinergic drugs — alpha-GPC opposes their action.
Scopolamine and similar agents — cholinergic ingredients may interact.
Tell your doctor if you take medication for memory or Alzheimer's disease.

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Frequently asked questions about AlphaSize® (Alpha-GPC — Chemi Nutra)

What is AlphaSize® (Alpha-GPC — Chemi Nutra)?

AlphaSize® is a branded, high-purity alpha-GPC (alpha-glycerylphosphorylcholine), a choline compound that readily crosses into the brain and serves as a building block for the neurotransmitter acetylcholine.

What is the recommended dosage of AlphaSize® (Alpha-GPC — Chemi Nutra)?

The clinically studied dose for AlphaSize® (Alpha-GPC — Chemi Nutra) is 300 to 600 mg per day for cognition; about 600 mg pre-exercise in sports studies.. Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is AlphaSize® (Alpha-GPC — Chemi Nutra) used for?

AlphaSize® (Alpha-GPC — Chemi Nutra) is studied for memory and cognition, power and exercise output, acetylcholine support. By supplying choline for acetylcholine synthesis, alpha-GPC supports memory and attention, and it has been studied in age-related cognitive decline both alone and alongside standard therapy.

Are there side effects from taking AlphaSize® (Alpha-GPC — Chemi Nutra)?

Reported potential side effects may include: GENERALLY WELL-TOLERATED — side effects are uncommon at normal doses. Mild headache, heartburn, or dizziness is occasionally reported. Always consult a healthcare provider before starting any new supplement, especially if you have underlying conditions or take medications.

Is AlphaSize® (Alpha-GPC — Chemi Nutra) safe to take?

Whether AlphaSize® (Alpha-GPC — Chemi Nutra) is safe depends on the dose, your overall health, and any medications you take. At studied doses, reported side effects can include: GENERALLY WELL-TOLERATED — side effects are uncommon at normal doses. It may also interact with certain medications. AlphaSize® (Alpha-GPC — Chemi Nutra) is not suitable for everyone — consult a healthcare provider before use if you are pregnant or breastfeeding, have a medical condition, or take prescription medications.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Sagaro GG, Amenta F. Comparison of the effects of choline alphoscerate and citicoline in patients with cognitive impairment. Front Neurol. 2025;16:1649661..PubMedUsed to support: Clinical evidence for alpha-GPC in cognition.