Also known as: CDP-Choline, Cytidine diphosphate-choline, Cognizin
Cognitive & NootropicGood evidence
A choline compound that delivers two useful molecules at once: choline for acetylcholine, and cytidine which converts to uridine. The main alternative to Alpha-GPC, and the better-studied of the two for cognition.
Typical dose
250.0–500.0 mg per day
Morning or early afternoon, with or without food
What it is
Citicoline, also called CDP-choline, is a naturally occurring compound made of choline joined to cytidine. It exists as an intermediate in the body's own production of phosphatidylcholine, a major component of cell membranes.
By weight it is around 18 per cent choline, considerably less than Alpha-GPC's 40 per cent. That looks like a disadvantage until you account for the cytidine half, which is doing separate work.
Cognizin is the branded, standardised form used in most of the research. Citicoline has a long record of supervised use in several countries, which gives it a better-characterised profile than most nootropic ingredients.
How it works
On ingestion, citicoline is broken into choline and cytidine, both of which are absorbed and cross into the brain, where they are reassembled.
The choline portion feeds acetylcholine synthesis, supporting attention and memory formation, which is the same route Alpha-GPC works through.
The cytidine portion converts to uridine, which supports synthesis of membrane phospholipids and has been studied for effects on dopamine receptor density. This dual action is what distinguishes citicoline from a simple choline source, and it is why the two products are not interchangeable despite both being sold as choline donors.
What the evidence shows
Citicoline has a larger human trial record than most nootropic ingredients, built up over decades of supervised use in several countries.
In healthy adults, trials have reported improvements in attention, focus and psychomotor speed, with similar findings in both adolescents and older adults. Effect sizes are modest but the direction is reasonably consistent.
Compared with Alpha-GPC, citicoline has the broader evidence base in cognitive outcomes, while Alpha-GPC has the small body of work on power output that citicoline lacks. For a cognitive goal, citicoline is the better-supported choice; for a pre-workout, Alpha-GPC has the more relevant research.
Dosing
Typical supplemental range is 250-500 mg daily. Trials in healthy adults have most often used 250 or 500 mg, and there is little evidence that going higher adds anything.
Take in the morning or early afternoon. Some people find it mildly alerting and sleep worse taking it late.
Citicoline is not hygroscopic in the way Alpha-GPC is, so it behaves better in powder blends and does not need a silica carrier. When comparing the two on price, account for the fact that they are doing partly different jobs rather than treating them as substitutes at equivalent choline content.
At a glance
Common forms
Cognizin citicoline, Generic citicoline powder, Capsules, Within nootropic blends
Half-life / duration
Two-phase clearance; effects on attention reported acutely and cumulatively
Timing
Morning or early afternoon, with or without food
Competition status
Permitted — not on the WADA Prohibited List
Category
Cognitive & Nootropic
Safety and side effects
Citicoline is well tolerated across a substantial trial record, with a better safety profile than most nootropic ingredients. Adverse effects are uncommon and mild: headache, digestive upset and occasional difficulty sleeping.
Because it raises choline availability, the general considerations around high choline intake apply, though at typical citicoline doses the choline load is modest.
Speak to your doctor before use if you take regular medication, particularly anything acting on the brain or nervous system.
Who should avoid it
Speak to your doctor before use if you take regular medication, particularly anything acting on the brain or nervous system. Take earlier in the day if you find it alerting. Not established at supplemental doses in pregnancy or breastfeeding.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
