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Citicoline
Citicoline is a water-soluble nootropic and naturally occurring ammonium salt nucleotide found in human and animal cells. Its structure links a cytidine nucleoside to choline through a diphosphate bridge, serving as an intermediate in phosphatidylcholine synthesis1. Supplementation provides choline and cytidine precursors1 and may support memory or attention, although some attention findings require replication. In healthy volunteers receiving citicoline at 600 or 1000 mg/day or placebo, no abnormal side effects were reported in hematological or clinical analyses1.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Duration
Subjective Effects
Pharmacology
Pharmacodynamics
Citicoline is an intermediate and choline donor in phosphatidylcholine biosynthesis. After hydrolysis, citicoline provides choline for acetylcholine synthesis; studies in transient cerebral ischemia suggest that it might enhance phosphatidylcholine synthesis, preserve cardiolipin and sphingomyelin, and stimulate glutathione synthesis and glutathione reductase activity, with the observed effects potentially explained by attenuation of phospholipase A2 activation2. It may also lower ischemia-induced glutamate concentrations and increase EAAT2-mediated glutamate uptake, which may reduce excitotoxic signaling. Choline-derived activity at nicotinic acetylcholine receptors has been proposed to contribute to dose-dependent analgesic effects.
Pharmacokinetics
Citicoline is hydrolyzed in the intestinal wall into choline and cytidine; after absorption, these cross the blood-brain barrier for re-synthesis into citicoline in the brain3. Citicoline is water-soluble with greater than 90% bioavailability; pharmacokinetic studies in healthy adults describe rapid absorption after oral dosing and biphasic plasma peaks at one hour and a second, larger peak at 24 hours after ingestion3. Pharmacokinetic studies using carbon-14-labelled citicoline show elimination mainly through respiratory carbon dioxide and urinary excretion in two phases3. Reported elimination half-lives are 56 hours for respiratory carbon dioxide and 71 hours for urinary excretion in pharmacokinetic studies using carbon-14-labelled citicoline3, and its concentration profile does not follow a single smooth exponential decline3.
Interactions
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Harm Potential
Addiction & Dependence
Psychological
Extremely LowCiticoline is not considered habit-forming; interest in repeated use may lessen over time, making use generally self-limiting.
Physical
Extremely LowCiticoline does not produce physical dependence.
Toxicity
At therapeutic doses, short-lived mild adverse effects are uncommon; when they occur, stomach pain and diarrhea are among the most typical.
Psychosis Risk
Citicoline may exacerbate psychotic episodes in susceptible individuals. A 2020 meta-analysis did not support the hypothesis that chronic citicoline use causes adverse psychiatric effects, though concerns had been raised.
History & Culture
Citicoline has been investigated as a treatment, supportive-care agent, or diagnostic aid for conditions including mania, hypomania, bipolar disorder, stroke, and cocaine abuse. Research has also examined its use in cognitive impairment associated with stroke, vascular dementia, Alzheimer’s…
Legality
International
Approved, investigational, and withdrawn regulatory listings are reported without a country-specific status.
References
Source Pages
Citations
Further Reading
Article Status
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