Citicoline vs Alpha-GPC: Two Choline Supplements, Very Different Evidence
Both are sold for focus and memory, and both supply choline. The direct comparisons come from injection studies and dementia trials. Citicoline's best healthy-adult data is for memory in older adults; alpha-GPC's is for short-term strength and attention tests in young men. Here is what each trial found and the safety signal worth knowing.
By Kymata Health Editorial Published Last checked
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Quick pick
From a partner brand · paid link
Jarrow Formulas Citicoline (Cognizin), 250 mg, 60 capsules
from HerbsPro
Its name matches citicoline sodium (e.g. Cognizin), one of the forms compared in our Forms table.
Label: 1 capsule: 250 mg citicoline (Cognizin).
Best for trying one bottle: $24.99 one-time (checked Oct 12, 2026).
Key takeaways
From 11 sources- Direct comparisons exist only in dementia or by injection: a 2025 meta-analysis of 3 trials (358 people with dementia) favored alpha-GPC on a global clinical scale but found no difference on memory tests11, and by injection, 1,000 mg of alpha-GPC raised blood choline more than 1,000 mg of citicoline3.
- Citicoline at 500 mg a day for 12 weeks improved episodic and composite memory scores (secondary outcomes) more than placebo in 100 healthy adults aged 50 to 85 with age-associated memory impairment5.
- Alpha-GPC at 600 mg a day for 6 days raised lower-body force in 13 college-aged men7, and a single 315 or 630 mg dose improved one attention test in 20 trained men8.
- In more than 12 million Korean adults aged 50 or older, people prescribed alpha-GPC had a higher 10-year stroke risk (adjusted hazard ratio 1.43 after matching); the study was observational and cannot show cause10.
- Total choline from food and supplements has an adult upper limit of 3,500 mg a day; very high intakes are linked to fishy body odor and low blood pressure1.
What this article covers
2 evidence profilesThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- CGrade CMemory in healthy older adults with age-associated memory impairmentImproved Overall memory, especially episodic memory, improved more than with placebo.Citicoline · RCT · n=100 · 2021 · PMID 33978188
- DGrade DLower-body force productionImproved Isometric mid-thigh pull peak force rose more than with placebo; upper-body force did not differ.Alpha-GPC · Crossover RCT · n=13 · 2015 · PMID 26582972
- DGrade DAttention test (Stroop) after one doseImproved Stroop scores improved more after both doses than after placebo 60 minutes after intake.Alpha-GPC · Crossover RCT · n=20 · 2024 · PMID 39683633
Two routes to the same nutrient
Choline is needed to make acetylcholine, a neurotransmitter involved in memory, mood and muscle control1. Citicoline (CDP-choline) and alpha-GPC (choline alfoscerate) are both choline-containing compounds sold as acetylcholine precursors2.
For blood choline, the form may matter less than expected. In a crossover study, 6 men took 550 mg of choline as choline chloride, choline bitartrate, alpha-GPC or egg phosphatidylcholine, and blood choline exposure did not differ between forms9. The water-soluble forms, alpha-GPC included, quickly raised TMAO, a gut-bacteria metabolite, while egg phosphatidylcholine did not9. Citicoline was not tested9. For the cheaper form, see alpha-GPC vs choline bitartrate.
The head-to-head studies: injections and dementia trials
In a 1992 crossover, 12 healthy volunteers received 1,000 mg of alpha-GPC and 1,000 mg of citicoline by intramuscular injection on separate days3. Blood choline rose quickly after both, but levels were considerably lower after citicoline3.
A 1991 open-label trial gave 120 people with mild to moderate vascular dementia 1 g a day of either compound by injection for 90 days4. Both groups improved and both were well tolerated, and alpha-GPC scored statistically better on most tests4. A 2025 meta-analysis pooled 3 randomized trials with 358 people with dementia: alpha-GPC scored better than citicoline on a global clinical scale (SCAG), but there was no significant difference on memory or word-fluency tests, and dropout rates were similar (9.4% vs 6.7%)11. All of this comes from injection studies or dementia populations, so none of it shows how capsules compare in healthy adults3411.
Citicoline: memory in older adults, attention in teens
In a 12-week trial in 100 healthy men and women aged 50 to 85 with age-associated memory impairment, 500 mg a day of citicoline (Cognizin) improved episodic memory and a composite memory score more than placebo; these were secondary outcomes5. Authors included employees of Kyowa Hakko Bio5.
In 75 healthy adolescent boys, 250 or 500 mg a day for 28 days improved attention and psychomotor speed compared with placebo6. Kyowa Hakko staff were also among this trial's authors6. Our search found no exercise-performance trials of citicoline. The citicoline page has the full evidence table.
Alpha-GPC: short-term force and attention in young men
In a crossover trial, 13 college-aged men took 600 mg a day of alpha-GPC or placebo for 6 days7. Peak force on an isometric mid-thigh pull rose more with alpha-GPC (98.8 N versus a 39.0 N drop with placebo), while the upper-body test did not reach significance7.
In 20 resistance-trained men, single doses of 630 mg or 315 mg improved Stroop test scores 60 minutes later compared with placebo, but not the Flanker or N-Back tests, and physical performance did not differ8. The author is a paid scientific advisor to the study's sponsor, NNB Nutrition8. Alpha-GPC's trials in older adults were in people with cognitive impairment or dementia; see the alpha-GPC page.
The safety signal worth knowing
A South Korean national cohort followed 12,008,977 adults aged 50 or older for stroke over roughly the next decade10. The 108,877 people prescribed alpha-GPC had higher risks of total stroke (adjusted hazard ratio 1.43 after matching), ischemic stroke and hemorrhagic stroke, with risk rising as use increased10. As an observational study it cannot rule out differences between users and nonusers that the adjustments missed, and the authors called for studies of mechanism10.
ODS notes that choline intake raises TMAO in a dose-dependent way, and TMAO has been linked to higher cardiovascular risk1. Adults have an Adequate Intake of 425 mg a day (women) and 550 mg (men), and an upper limit of 3,500 mg a day from all sources; high intakes are associated with fishy body odor, sweating, vomiting and low blood pressure1.
Which one fits your goal
What the trials above support, by goal:
- Memory in midlife and later: citicoline has the healthy-adult trial, at 500 mg a day for 12 weeks5.
- Pre-workout power or focus: alpha-GPC has small short-term trials at 315 to 630 mg78.
- Raising blood choline: equal choline doses of alpha-GPC and other forms gave similar blood choline in one small study9.
- Stroke risk factors or heart concerns: the observational stroke signal for alpha-GPC is worth discussing with a clinician10.
- Stacking choline products: count total choline toward the 3,500 mg adult upper limit1.
Quick answers
Common questions
3 answersCan you take citicoline and alpha-GPC together?
We found no trial testing the two together. If you combine them, total choline from all sources counts toward the adult upper limit of 3,500 mg a day1.
Which is better before a workout?
Does alpha-GPC cause strokes?
That has not been shown. A large Korean cohort found people prescribed alpha-GPC had a higher 10-year stroke risk, but the design cannot prove cause10.
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safetyRelated articles
4 articles- ArticleAlpha-GPC vs Choline Bitartrate: Blood Choline Rose the Same, but One Detail DifferedIs alpha-GPC better than choline bitartrate?
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- ArticleAshwagandha Interactions: Thyroid Medicine, Sedatives, SSRIs, Alcohol, Magnesium and L-TheanineWhat does ashwagandha interact with?
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Where to buy Citicoline
Products from brands we partner with that contain Citicoline. Check the amount per serving against the doses studied, and the label for other ingredients.
Citicoline products from partner brands
5 products Paid links · we earn a commission- Quick pickHerbsProJarrow Formulas Citicoline (Cognizin), 250 mg, 60 capsules
1 capsule: 250 mg citicoline (Cognizin); label directions up to 2 capsules daily with food
$24.99one-timeChecked Oct 12, 2026 - SupersmartCDP Choline5% off with the Supersmart newsletterGet 5% off with the newsletter (paid link, opens in new tab)
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2 capsules: 500 mg Cognizin citicoline, the dose used in the 2021 memory trial above; 30 servings
$39.65one-time$33.70subscribeOn sale from $61 on 2026-10-11Checked Oct 11, 2026 - OnnitOnnit Alpha BRAIN Black Label (80 capsules)We use this brand at home. What we useSubscribe & Save 15%
Offer details
Choose Subscribe & Save on the product page; skip, swap or cancel anytime.
- 15% off MSRP on subscription-eligible products unless otherwise noted.
- Does not stack with sale pricing; the greater discount applies.
- Offer terms from Onnit’s site, checked Oct 13, 2026. Offers can change; the brand's checkout is final.
CGrade C, limited (Grade C) 250 mg citicoline per serving, half the 500 mg a day of the trials cited here; the formula itself has not been trialed.
Caution: Contains L-dopa from velvet bean (Mucuna pruriens): do not combine with levodopa, MAO inhibitors or antipsychotics. Also contains huperzine A and 25 mg caffeine.
4 capsules: 250 mg Cognizin citicoline plus lion’s mane, phosphatidylserine, velvet bean (L-dopa), caffeine 25 mg and other ingredients; 20 servings
$124.95one-time$106.21subscribeChecked Oct 20, 2026 - OnnitOnnit Alpha BRAIN Focus Shot, tropical (6 × 2.5 fl oz)We use this brand at home. What we useSubscribe & Save 15%
Offer details
Choose Subscribe & Save on the product page; skip, swap or cancel anytime.
- 15% off MSRP on subscription-eligible products unless otherwise noted.
- Does not stack with sale pricing; the greater discount applies.
- Offer terms from Onnit’s site, checked Oct 13, 2026. Offers can change; the brand's checkout is final.
CGrade C, limited (Grade C) 250 mg citicoline per bottle, half the 500 mg a day of the trials cited here; the shot itself has not been trialed.
Caution: Contains huperzine A and 50 mg caffeine: check with a clinician if you take prescription medicines.
1 bottle: 250 mg Cognizin citicoline with 200 mg L-theanine, 250 mg lion’s mane extract, 50 mg caffeine and about 100 mcg huperzine A; 6 servings
$23.99one-time$20.40subscribeChecked Oct 20, 2026 - GoliGoli Matcha Mind Cognitive Gummies, 60 gummies
3 gummies: 250 mg Cognizin citicoline and 100 mg matcha powder; label suggests 3 gummies once daily
Checked Oct 15, 2026
References
11 sources. Numbers in the text link here.
Sources cited in this article
11 sources- 1Choline: Fact Sheet for Health Professionals (Updated June 2, 2022)NIH Office of Dietary Supplements, 2022
- 2Choline supplements: An updateFront Endocrinol (Lausanne), 2023 · PMID 36950691
- 3A comparative study of free plasma choline levels following intramuscular administration of L-alpha-glycerylphosphorylcholine and citicoline in normal volunteersInt J Clin Pharmacol Ther Toxicol, 1992 · PMID 1428296
- 4A multicentre trial to evaluate the efficacy and tolerability of alpha-glycerylphosphorylcholine versus cytosine diphosphocholine in patients with vascular dementiaJ Int Med Res, 1991 · PMID 1916007
- 5Citicoline and Memory Function in Healthy Older Adults: A Randomized, Double-Blind, Placebo-Controlled Clinical TrialJ Nutr, 2021 · PMID 33978188
- 6The Effect of Citicoline Supplementation on Motor Speed and Attention in Adolescent MalesJ Atten Disord, 2019 · PMID 26179181
- 7The effect of 6 days of alpha glycerylphosphorylcholine on isometric strengthJ Int Soc Sports Nutr, 2015 · PMID 26582972
- 8Acute Alpha-Glycerylphosphorylcholine Supplementation Enhances Cognitive Performance in Healthy MenNutrients, 2024 · PMID 39683633
- 9Differential metabolism of choline supplements in adult volunteersEur J Nutr, 2022 · PMID 34287673
- 10Association of L-alpha Glycerylphosphorylcholine With Subsequent Stroke Risk After 10 YearsJAMA Netw Open, 2021 · PMID 34817582
- 11Comparison of the effects of choline alphoscerate and citicoline in patients with dementia disorders: a systematic review and meta-analysisFront Neurol, 2025 · PMID 41426989
Citicoline and other dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to your clinician or pharmacist before starting a supplement, especially if you take prescription medicines. Product links on this page are paid partner links.