Choline (Alpha-GPC / CDP-choline)
Citicoline / Alpha GPC / Alpha-GPC · Brain
Acetylcholine precursors — the standard "stack base" nootropics, with modest real evidence and one cardiovascular question mark.
What the evidence says
Citicoline has a respectable set of small human trials showing attention and memory signals, mostly in older or impaired groups; Alpha-GPC adds a few power-output studies in athletes. Healthy-young-adult benefits are subtler than the nootropic forums imply.
What studies used
Cognition trials used Alpha-GPC 300–600 mg or citicoline 250–500 mg per day. Published studies had not established a timing dependence.
Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.
Watch out for
- A 2021 Korean cohort study (age 50+, prescription-exposure data, observational) associated Alpha-GPC use with higher stroke incidence — not a randomized finding and not about ordinary supplement use, but unresolved
- Headache or low mood at high doses is the community's consistent overshoot report
Evidence base
established literature
Large human evidence base: several phase 3 or 4 trial reports, plus multiple meta-analyses or systematic reviews.
This letter measures how much human research exists, not whether it works for you — the tier above (Moderate) is the read on quality.
Research (12)
- Choline supplements: An updateFront Endocrinol (Lausanne) · 2023
- Citicoline: pharmacological and clinical review, 2022 updateRev Neurol · 2022
- Application of Citicoline in Neurological Disorders: A Systematic ReviewNutrients · 2020
- The Effect of Citicoline Supplementation on Motor Speed and Attention in Adolescent MalesJ Atten Disord · 2019
- Is Citicoline Effective in Preventing and Slowing Down Dementia?-A Systematic Review and a Meta-AnalysisNutrients · 2023
- Citicoline and Memory Function in Healthy Older Adults: A Randomized, Double-Blind, Placebo-Controlled Clinical TrialJ Nutr · 2021
- Use of Citicoline in Attention-Deficit/Hyperactivity Disorder: A Pilot StudyClin Neuropharmacol · 2024
- L-Alpha-Glycerylphosphorylcholine (L-α-GPC): A Comprehensive Review of Its Preparation Techniques and Versatile Biological EffectsJ Food Sci · 2025
- L-alpha-glycerylphosphorylcholineJ Am Chem Soc · 1948
- Membrane stabilizer: citicolineCurr Med Res Opin · 2002
- Unlocking the Potential of l-α-Glycerylphosphorylcholine: From Metabolic Pathways to Therapeutic ApplicationsNutr Rev · 2025
- [Chronic traumatic encephalopathy]Zh Nevrol Psikhiatr Im S S Korsakova · 2025
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