Alpha-GPC

Best for

Sharpen focus and mental stamina

Large effect, needs confirmation · 315–600 mg/day for 12 weeks · 2 studies , n=114

6 papers · 4 claims · 13 outcomes scored · 4 positive

Outcomes

What alpha-gpc actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Sharpen focus and mental stamina Large effect, needs confirmation

Concentrate longer, resist distraction, and stay mentally sharp through demanding tasks.

2 RCTs n=114 315–600 mg 12 wk #3/40

39300341·39683633

large

2 RCTs n=114

315–600 mg

12 wk

#3 /40

Slow cognitive decline in dementia Likely benefit

Memory, attention, and orientation hold up longer before fading.

2 meta-analyses n=523 600–1200 mg 12–26 wk #1/23

36683513·39300341

moderate

2 meta-analyses n=523 Meta-analyzed I²=98%

600–1200 mg

12–26 wk

#1 /23

Strengthen your memory Faint early signal

Names, conversations, faces, and details stick instead of dissolving.

1 RCT n=40 630 mg — #3/42

39683633

small

1 RCT n=40

630 mg

—

#3 /42

Speed up thinking and reactions Not enough research

Shortens the gap between seeing a question and having the answer.

1 RCT n=24 500 mg 1 wk

29042830

trivial

1 RCT n=24

500 mg

1 wk

—

Outcome	Effect	Evidence	Dose	Weeks	Rank
Sharpen focus and mental stamina Large effect, needs confirmation	large	2 RCTs n=114	315–600 mg	12 wk	#3/40
Slow cognitive decline in dementia Likely benefit	moderate	2 meta-analyses n=523 Meta-analyzed	600–1200 mg	12–26 wk	#1/23
Strengthen your memory Faint early signal	small	1 RCT n=40	630 mg	—	#3/42
Speed up thinking and reactions Not enough research	trivial	1 RCT n=24	500 mg	1 wk	—

Buy well

Recommended Alpha-GPC products

Real products that dose Alpha-GPC where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Alpha-GPC dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

Risk profile

Adverse events and known drug interactions

Safety events

bloating mild

treatment-emergent adverse events (overall)

Gastrointestinal disorders

Infections and infestations

General disorders and administration site conditions

Respiratory, thoracic and mediastinal disorders

Nervous system disorders

overall adverse event profile (various mild AEs reported, none leading to discontinuation)

Sources

Generated August 14, 2026

Evidence map
Focus & memory
Focus & memory: evidence map across 45 supplements
Evidence coverage map
Jul 30, 2026

Alpha-GPC

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More evidence for Alpha-GPC

NewFocus & memory: evidence map across 45 supplements

Focus & memory: evidence map across 45 supplements