Citicoline vs Alpha GPC: Which Choline Supplement Is Better?

Citicoline and alpha GPC are the two choline supplements most often used for focus and memory. Both give the brain choline, the raw material for acetylcholine, a messenger involved in attention and memory. They differ in how much choline they carry, what comes with it, and what the research has looked at. This guide compares citicoline vs alpha GPC on benefits, how much to take, side effects, and which one fits your goal.

It is educational, not medical advice.

Key Takeaways

• Both are choline sources. Citicoline (CDP-choline) supplies choline plus cytidine; alpha GPC (choline alfoscerate) supplies choline plus glycerophosphate.
• Alpha GPC carries more choline per milligram, about 40 percent by weight, compared with roughly 20 percent for citicoline.
• Citicoline research includes a 12-week trial in healthy adults aged 50 to 85, where 500 mg a day improved episodic memory compared with placebo, and a brain imaging study showing higher energy markers.
• Alpha GPC research in healthy young adults shows a clear rise in blood choline within hours of a 250 or 500 mg dose.
• Keep total choline under 3,500 mg a day from all sources, the adult upper limit, and talk with a clinician if you have heart or blood vessel concerns.

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What Is Citicoline?

Citicoline, also called CDP-choline, is a compound your body makes on the way to building phosphatidylcholine, a main building block of cell membranes, including in the brain. When you take it as a supplement, it supplies both choline and cytidine, which the body can use to build membranes and acetylcholine (Kansakar et al., 2023).

Citicoline has also been studied for brain energy. In 16 healthy adults with an average age of 47, taking 500 mg or 2,000 mg a day for 6 weeks raised phosphocreatine by about 7 percent and ATP by about 14 percent in the frontal part of the brain, measured by magnetic resonance spectroscopy (Silveri et al., 2008).

What Is Alpha GPC?

Alpha GPC (L-alpha glycerylphosphorylcholine, or choline alfoscerate) is a natural choline compound found in small amounts in foods and in the body. It is widely used as a supplement because it is rich in choline, about 40 percent by weight, and is readily absorbed. More detail is on our alpha GPC ingredient page.

In a randomized trial of 48 healthy college-aged men, a single dose of alpha GPC raised free choline in the blood by 59 percent at 250 mg and 132 percent at 500 mg compared with placebo, measured 1 to 2 hours later. Scores on a reaction-time vigilance test were similar across the groups after a week of daily use (Marcus et al., 2017).

Citicoline vs Alpha GPC at a Glance

Choline percentages are calculated from each molecule’s formula and are approximate.

For citicoline on its own, including when to take it and its side effects, see our full citicoline benefits guide.

Citicoline Benefits: What the Research Shows

• Memory with age. In a 12-week randomized, double-blind trial of 100 healthy men and women aged 50 to 85 with everyday age-related memory complaints, 500 mg of citicoline a day improved episodic memory and a composite memory score more than placebo (Nakazaki et al., 2021).
• Brain energy markers. Six weeks of citicoline raised phosphocreatine and ATP in the frontal lobe of healthy middle-aged adults (Silveri et al., 2008).
• Membrane building blocks. Because it supplies cytidine as well as choline, citicoline feeds the pathway cells use to build and repair their membranes (Kansakar et al., 2023).

Alpha GPC Benefits: What the Research Shows

• A concentrated choline source. With about 40 percent choline by weight, alpha GPC delivers more choline per capsule than most other forms.
• Raises blood choline. Blood choline rose within 1 to 2 hours of 250 or 500 mg in healthy young men (Marcus et al., 2017).
• Acetylcholine precursor. Reviews describe alpha GPC and citicoline as cholinergic compounds used to support memory and cognitive function (Kansakar et al., 2023).

For more on how acetylcholine works, see our acetylcholine guide.

Which Is Better for Focus and Memory?

It depends on what you want from a choline supplement:

• Choose citicoline if memory with age is your main interest, since that is where its longest trial in healthy people was done, or if you like the idea of also supplying cytidine.
• Choose alpha GPC if you want the most choline per milligram, for example as part of a focus formula.
• Either way, sleep, exercise and a diet with choline-rich foods such as eggs, fish and soybeans lay the groundwork.

Our Clarity Nasal Spray includes 20 mg of alpha GPC per 2-spray serving as a supporting ingredient, alongside NAD+ 150 mg, huperzine A 200 mcg and vitamin B12 500 mcg. For a capsule option built around botanicals, see Clarity Capsules. Our cognitive health and mental clarity guide and best supplements for focus and concentration compare more options, and huperzine A benefits covers the ingredient that pairs with choline in Clarity. For why the two are paired and how to choose between them, see our guide to huperzine A and alpha GPC. To pair alpha GPC with an amino acid from tea, see our guide to alpha GPC and L-theanine, which explains how they differ and work together.

Can You Take Citicoline and Alpha GPC Together?

Some focus stacks combine them. If you do, add up the choline from both, plus any other choline supplements, and keep your total within the adult upper limit of 3,500 mg a day from all sources (NIH Office of Dietary Supplements: Choline). Starting with one at a time makes it easier to tell what suits you.

For daily choline needs by age, the upper limit and food sources, see our guide to choline supplements.

How Much Citicoline or Alpha GPC to Take

• Citicoline: the studies above used 500 mg a day, and up to 2,000 mg a day in the 6-week imaging study (Nakazaki et al., 2021, Silveri et al., 2008).
• Alpha GPC: 250 to 500 mg a day was used in healthy young adults (Marcus et al., 2017).
• Choline targets: adequate intake from all sources is 550 mg a day for men and 425 mg for women (NIH Office of Dietary Supplements: Choline).
• Follow your product label and take it at a consistent time, usually with a morning meal.

For a closer look at alpha GPC's reported side effects and the 2021 stroke study, see our guide to alpha GPC side effects.

Side Effects and Safety

• Too much choline can cause a fishy body odor, vomiting, sweating, excess saliva and low blood pressure; the adult upper limit is 3,500 mg a day (NIH Office of Dietary Supplements: Choline).
• TMAO: gut bacteria turn some choline into trimethylamine, which the liver converts to TMAO, a substance linked to higher cardiovascular risk (NIH Office of Dietary Supplements: Choline).
• Alpha GPC and stroke risk: in a Korean health insurance cohort of about 12 million adults aged 50 and over, people prescribed alpha GPC had a higher 10-year risk of stroke than non-users, even after matching for other factors (Lee et al., 2021). The study was observational, so it cannot show cause and effect, but talk with your clinician before using alpha GPC if you have heart or blood vessel concerns.
• Check with your clinician first if you are pregnant or breastfeeding, under 18, or take prescription medication.

For another brain energy option with a strong safety record, see creatine for brain health, and for a focus pairing without choline, L-theanine vs L-tyrosine.

Coming soon from Synchronicity: our Brain Energy Capsules are planned with citicoline 500 mg, the amount used in the 12-week memory trial, plus PQQ 20 mg and L-ergothioneine 25 mg per serving. Join the waitlist on the product page to hear when they launch; no payment is taken.

Sources

• Kansakar U et al. Choline supplements: An update. Frontiers in Endocrinology, 2023. DOI
• Silveri MM et al. Citicoline enhances frontal lobe bioenergetics as measured by phosphorus magnetic resonance spectroscopy. NMR in Biomedicine, 2008. DOI
• Marcus L et al. Evaluation of the effects of two doses of alpha glycerylphosphorylcholine on physical and psychomotor performance. Journal of the International Society of Sports Nutrition, 2017. DOI
• Nakazaki E et al. Citicoline and Memory Function in Healthy Older Adults: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial. The Journal of Nutrition, 2021. DOI
• NIH Office of Dietary Supplements. Choline: Fact Sheet for Health Professionals. Updated 2022. ODS
• Lee G et al. Association of L-α Glycerylphosphorylcholine With Subsequent Stroke Risk After 10 Years. JAMA Network Open, 2021. DOI

Frequently Asked Questions

What is the difference between citicoline and alpha GPC?

Both supply choline. Alpha GPC is about 40 percent choline by weight and comes with glycerophosphate; citicoline is about 20 percent choline and also supplies cytidine, which the body uses to build cell membranes.

Is citicoline or alpha GPC better for memory?

Citicoline has a 12-week trial in healthy adults aged 50 to 85 in which 500 mg a day improved episodic memory compared with placebo. Alpha GPC delivers more choline per milligram and raises blood choline within hours.

Which is better for focus?

Both feed the acetylcholine pathway involved in attention. Many people pick alpha GPC for the most choline per dose and citicoline for its memory and brain energy research.

Can you take citicoline and alpha GPC together?

Yes, some stacks combine them. Keep total choline from all sources under 3,500 mg a day and start with one at a time.

How much citicoline should I take?

Studies used 500 mg a day, and up to 2,000 mg a day in one 6-week study. Follow your product label.

How much alpha GPC should I take?

Studies in healthy young adults used 250 to 500 mg a day. Follow your product label.

What are the side effects of citicoline and alpha GPC?

Too much choline can cause a fishy body odor, sweating, stomach upset and low blood pressure. An observational study linked alpha GPC prescriptions with a higher stroke risk in older adults, so check with a clinician if you have heart or blood vessel concerns.

What is CDP-choline?

CDP-choline is another name for citicoline, short for cytidine diphosphate-choline.

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These statements have not been evaluated by the Food and Drug Administration. This content is for education and is not medical advice. Our products are not intended to diagnose, treat, cure or prevent any disease. Talk with a healthcare provider before starting a new supplement if you are pregnant, breastfeeding or taking medication.