What is citicoline? A plain-English guide

The body makes a compound called CDP-choline on its own [1]. When the same compound is given as a drug, it can be called citicoline [1]. The form approved for food in the UK is made by microbes [7].

Citicoline has been used as a drug since the 1980s, and more recently as a food ingredient [2]. A 2005 Cochrane review described it as a frequently prescribed drug for cognitive impairment (problems with thinking and memory) in several European countries [1]. A Cochrane review is a careful summary of the trials on one question [1].

Here is how scientists think it works, which is not proof that it does anything. Once swallowed, citicoline breaks down into choline and cytidine [2]. The body uses choline to make acetylcholine, a brain chemical that carries messages between nerve cells [2]. CDP-choline is also needed to build part of the outer layer of cells [1]. Even so, EU experts found no convincing evidence of a way citicoline could affect memory in humans [4].

Researchers have studied citicoline for memory and attention, often in older adults [1][4]. Health Canada lets approved products carry the claim "Helps (to) improve sustained attention" [9]. That is wording Canada's rules allow on a label; it is not a study finding.

Citicoline has also been studied in people who had just had a stroke [6]. Those results may not apply to healthy adults [6].

Does citicoline help memory?

Evidence grade for episodic memory: C, limited. Why this grade

The evidence is mixed [3][4]. One trial was funded by the ingredient supplier Kyowa Hakko Bio, which helped design it, and two of its authors worked for the company [3]. In this 12-week trial, 100 adults aged 50 to 85 with memory complaints took part [3]. Of these, 49 took 500 mg a day and 51 took a placebo, a dummy pill [3].

It was a randomized trial, which means chance decided who got which pill [3]. The main test the trial was set up to measure did not show a clear difference between the groups [3]. On extra tests, the citicoline group did better than placebo on one memory test and on a combined memory score [3].

In 2024, EU food safety experts assessed three studies sent in with a health claim application [4]. They concluded that cause and effect between citicoline and memory has not been shown [4]. They noted that the memory effect was not seen in another trial that used 1 g a day for 3 months [4]. Because the trials studied middle-aged and older adults, the results may not apply to younger healthy adults [4].

Does citicoline help attention?

Evidence grade for attention: C, limited. Why this grade

In a 28-day trial, 75 healthy teenage boys were split by chance [5]. Of these, 51 took 250 or 500 mg of citicoline a day and 24 took a placebo [5]. Three of the trial's seven authors were from Kyowa Hakko companies, which supply the ingredient [5]. The citicoline group showed better attention than the placebo group [5]. These results, from teenage boys, may not apply to adults or to girls and women [5].

In the trial in older adults funded by Kyowa Hakko Bio, citicoline showed no clear difference from placebo on an attention task [3]. A Cochrane review of 14 trials looked at older people with long-term brain disorders [1]. It found no evidence of a benefit on attention, though it found some evidence of benefit on memory [1]. Its lead author had worked on some of those trials [1]. Those results may not apply to healthy adults [1].

As of November 11, 2026, we found no supplier-independent randomized trial of citicoline alone on attention in healthy adults (PubMed and Europe PMC searches).

To see what the grades mean, read how we grade evidence.

Table: Doses used in studies (not a recommendation)

These are amounts used in research, not advice, so talk to a clinician about your own situation. For comparison, UK rules cap citicoline in food supplements at 500 mg a day [7].

In the trial in older adults funded by Kyowa Hakko Bio, none of the side effects were judged serious [3]. In that trial, 6 mild problems possibly linked to citicoline were reported, against 2 on placebo [3]. They included headache, gas and burping [3].

Health Canada says products under its rules must warn that users may get headaches or stomach and gut discomfort [9]. A 2020 Cochrane review of stroke trials found that harms were poorly reported [6]. The reviewers concluded that the safety profile of citicoline remains unknown [6].

Health Canada also says products must tell users to ask a health care practitioner before use with dopaminergic or cholinergic drugs [9]. These are medicines that act on the brain chemicals dopamine or acetylcholine. If you take any of these medicines, talk to your doctor or pharmacist before combining them with citicoline.

• Children. UK rules say labels must state the product is not meant for children [7]. The EU's 2014 authorization says citicoline shall not be used in foods meant for children [8]. Health Canada's rules cover adults 18 years and older [9].
• People who are pregnant or breastfeeding. Health Canada labels must say to ask a health care practitioner before use [9].
• People with an attention deficit disorder. Health Canada labels for products with an attention claim must say to ask a practitioner first [9].

Is citicoline the same as choline?

No. After it is swallowed, citicoline breaks down into choline and another compound called cytidine [2].

Who paid for the two main trials on this page?

The 12-week memory trial was funded by the ingredient supplier Kyowa Hakko Bio [3]. The attention trial in teenage boys had three authors from Kyowa Hakko companies [5].