Citicoline
Also known as: CDP-Choline, Cytidine diphosphate-choline, Cognizin
Citicoline breaks down to choline and cytidine (converted to uridine), both of which cross the blood-brain barrier and feed phospholipid synthesis. European clinical use in stroke recovery is established; evidence in healthy young adults is thinner but includes positive attention studies at 250–500 mg.
Last reviewed: 2026-10-06 · 0 indexed studies
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Overview
Citicoline (CDP-choline) is a choline donor and uridine precursor that supports phosphatidylcholine synthesis in neuronal membranes. It has a substantial clinical history in stroke and cognitive impairment in some countries, and is a popular nootropic-stack ingredient.
Mechanism & Function
Mechanism of Action
Provides choline for acetylcholine and phosphatidylcholine synthesis, and uridine for membrane phospholipid production; may support dopaminergic signalling and membrane repair.
Physiological Role
Choline is an essential nutrient for acetylcholine synthesis, membrane phospholipids and methyl-group metabolism.
Primary Pathways
Performance / Health Relevance
Relevant to attention and focus; commonly stacked with caffeine.
Evidence Review
No human clinical studies indexed for this ingredient yet.
No meta-analyses or systematic reviews indexed for this ingredient yet.
Dimensions marked N/A have no indexed evidence of that class. They are shown as unavailable rather than scored.
Compare Choline Forms
Full comparison4 choline forms are indexed. Bioavailability, clinical evidence, and best-use cases differ meaningfully between them.
| Form | Evidence |
|---|---|
CiticolineThis page Near-complete oral absorption; hydrolysed to choline and cytidine before crossing the blood-brain barrier. | 45/100 |
| Alpha-GPC Superior choline bioavailability vs CDP-choline or choline bitartrate | 78/100 |
| Silicon (Orthosilicic Acid) Oral orthosilicic acid formulations showed measurable increases in plasma and urinary Si over 6 h, indicating absorption; stabilised forms (choline or vanillin complexes) aim to limit polymerisation and improve bioavailability. | 61/100 |
| Choline (Choline Bitartrate) Choline bitartrate is well-absorbed, but significant first-pass metabolism can limit its systemic bioavailability for direct cholinergic effects compared to more advanced forms like CDP-choline or Alpha-GPC. | 60/100 |
Practical Use & Dosage
- Minimum Effective Dose
- 250 mg/day
- Optimal Range
- 250–500 mg/day
- Upper / Caution Level
- Up to 2,000 mg/day used clinically; well tolerated
- Timing
- Morning or pre-task; daily
- Best Format
- Citicoline powder or capsules (branded Cognizin is common)
- Bioavailability
- Near-complete oral absorption; hydrolysed to choline and cytidine before crossing the blood-brain barrier.
- Absorption Considerations
- Effects on attention can be acute, but membrane-related benefits accrue with chronic use.
Safety & Interactions
Side Effects
- •Rare headache
- •Rare GI upset
Contraindications
- None well established
Drug Interactions
- •Levodopa (citicoline may potentiate — clinical note)
Who Should Avoid
- •None well established
Monitoring
None routinely.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Citicoline typically used or indicated?
Citicoline is most commonly used for: Nootropic stacks, Focus and attention formulas, Brain-health supplements. Choline is an essential nutrient for acetylcholine synthesis, membrane phospholipids and methyl-group metabolism.
How does Citicoline work?
Provides choline for acetylcholine and phosphatidylcholine synthesis, and uridine for membrane phospholipid production; may support dopaminergic signalling and membrane repair.
What is the recommended dose of Citicoline?
The optimal range is 250–500 mg/day. with a minimum effective dose of 250 mg/day. Best taken: Morning or pre-task; daily. Upper / caution level: Up to 2,000 mg/day used clinically; well tolerated.
What are the side effects of Citicoline?
Reported side effects include: Rare headache; and Rare GI upset. Monitoring: None routinely.
Does Citicoline interact with medications?
Known or theoretical interactions: Levodopa (citicoline may potentiate — clinical note). Always check with a clinician before combining with prescription medication.
Who should avoid Citicoline?
Citicoline is generally not recommended for: None well established; and None well established.
How strong is the evidence for Citicoline?
Evidence level: Limited (overall score 45/100), based on 0 indexed studies on SuppIndex.
Research & References (0)
No studies match this filter
Trademark Ingredients
Related Ingredients
Other top-rated ingredients in Nootropics.
Caffeine Anhydrous
90/100Methylxanthine alkaloid; non-selective adenosine A1/A2A receptor antagonist; raises cAMP, catecholamine release, and Ca²⁺ sensitivity in muscle.
Alpha-GPC
78/100Highly bioavailable choline donor that elevates brain acetylcholine levels, supporting memory, learning, and muscular power output via enhanced neuromuscular junction signaling.
L-Theanine
72/100A non-proteinogenic amino acid analog of glutamate that crosses the BBB, promoting alpha-wave brain activity and modulating inhibitory neurotransmitter balance.
Research Overview
Limited EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/citicoline
SuppIndex. (2026). Citicoline: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/citicoline
Based on 0 indexed studies · Evidence level: Limited.
Goal Ratings
Stack Compatibility
Staple of caffeine + nootropic stacks; pairs with bacopa or phosphatidylserine.