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Moderate evidenceBrain & cognition

Alpha-GPC

A choline compound with genuine clinical data in age-related cognitive decline, mostly as an add-on to dementia drugs. The bodybuilding and "power output" marketing rests on a handful of tiny trials, and an observational stroke-risk signal deserves attention.

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What the science says

  • Cognitive decline and dementia Moderate evidence

    A 2023 systematic review and meta-analysis of choline alphoscerate in adult-onset cognitive dysfunction found statistically significant improvements on cognitive and functional scales versus control across the pooled trials. Most of these studies were conducted in Italy over 3-6 months at 1,200 mg/day, several are decades old, and methodological quality is uneven.

  • Add-on to donepezil in Alzheimer's disease Moderate evidence

    In the ASCOMALVA trial, patients on donepezil 10 mg plus choline alphoscerate 1,200 mg/day showed better MMSE, ADAS-Cog and behavioural (NPI) scores than donepezil alone over 24 months. It is a single, relatively small, single-country randomized trial, so this is promising rather than established.

  • Power output and exercise performance Limited evidence

    Acute doses of 600 mg have been reported to raise peak bench-throw force and countermovement jump power in small crossover studies, typically with fewer than 20 subjects and inconsistent outcome measures. No adequately powered trial has confirmed a performance benefit, and effects on training adaptation over weeks are untested.

  • Growth hormone release Limited evidence

    Alpha-GPC acutely raises serum growth hormone in small studies, but the spike is short-lived and comparable to what exercise itself produces. There is no evidence this translates into changes in body composition or strength.

Dosage & safety

Studied doseCognitive studies use 400 mg three times daily (1,200 mg/day) for 3-24 months. Performance studies use a single 300-600 mg dose 30-60 minutes pre-exercise. Typical consumer products supply 300-600 mg/day of 50% alpha-GPC powder, which is hygroscopic and clumps easily.
SafetyUsually well tolerated; heartburn, nausea, headache, insomnia and dizziness are the common complaints, and it can be over-stimulating for some at higher doses. A large South Korean national claims-database analysis reported a higher 10-year stroke incidence among choline alphoscerate users, which is observational and unconfirmed but not trivial given the population that takes it. Choline alphoscerate is a prescription medicine in Italy, Russia, South Korea and several other countries, and is sold as a supplement in the US. Caution with cholinergic drugs and anticholinergics, which it may oppose or amplify.

How to take it

TimingMorning, or 30-60 minutes before training for the acute performance dose; avoid late evening as it can be over-stimulating.
With food?With or without food.
Worth knowingThe powder is intensely hygroscopic and turns to sludge in humid air — keep it sealed and dry, or use capsules.

Interactions

With medications

  • cholinesterase inhibitors (donepezil, rivastigmine)

    Additive cholinergic effects such as nausea, sweating, cramps and slowed heart rate. do not combine without medical supervision

  • anticholinergic drugs (oxybutynin, scopolamine, some antihistamines)

    Alpha-GPC works in the opposite direction and may reduce their intended effect. talk to your doctor before combining

With other supplements

  • huperzine A and other cholinergics

    Additive cholinergic side effects — nausea, headache, cramps, vivid dreams. avoid stacking, or lower both doses

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does alpha-GPC improve memory?

Alpha-GPC has moderate evidence in age-related cognitive decline and dementia, mostly at 1,200 mg/day as an add-on to dementia drugs such as donepezil. There is no comparable evidence that alpha-GPC boosts memory in healthy young people.

Does alpha-GPC increase power output or growth hormone?

The evidence is limited: small crossover studies with fewer than 20 people reported higher power after 600 mg of alpha-GPC, and growth hormone rises briefly. Neither has been shown to improve strength or body composition over time.

How much alpha-GPC should I take?

Cognitive studies used alpha-GPC at 400 mg three times daily (1,200 mg/day); performance studies used a single 300-600 mg dose 30-60 minutes before exercise. Avoid late-evening doses, as alpha-GPC can be over-stimulating.

Does alpha-GPC increase stroke risk?

A large South Korean claims-database analysis reported higher 10-year stroke incidence among alpha-GPC users. It is observational and unconfirmed, but not trivial given the older population that takes alpha-GPC.

Scientific references

Where to buy

EVLution Nutrition, Alpha GPC, 60 Veggie Capsules (300 mg per Capsule)

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