Alpha-GPC vs Citicoline (Compared)

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The Short Answer Alpha-GPC is about 40% choline by weight and citicoline about 20%, so per milligram alpha-GPC gives roughly twice the choline; citicoline also supplies cytidine, which the body turns into uridine. Small trials of each in healthy adults show modest, inconsistent effects, and we found no trial comparing the two directly in healthy people. If your goal is simply getting enough choline, choline bitartrate costs far less than either.

The Two Options

Limited Evidence

Alpha-GPC

Alpha-GPC (L-alpha-glycerylphosphorylcholine, also called choline alfoscerate) is about 40% choline by weight and raises blood choline after an oral dose. Small, mostly maker-funded trials in healthy adults show mixed results for attention and exercise performance.

Dose: 250 to 630 mg a day or as a single dose in healthy-adult trials; 1,000 mg in one growth hormone study.

Moderate Evidence

Citicoline

Citicoline (CDP-choline) is a compound the body makes on the way to phosphatidylcholine. It is about 20% choline by weight and also supplies cytidine, which the body converts to uridine. The best-known supplement brand is Cognizin® (Kyowa Hakko Bio); citicoline is also a prescription drug in some countries.

Dose: 250 to 500 mg a day in healthy-adult trials; the 12-week memory trial used 500 mg a day.

Head-to-Head Comparison

	Alpha-GPC	Citicoline
Choline content per gram	About 40%	About 20%
Doses in healthy-adult trials	250 to 630 mg (active alpha-GPC)	250 to 500 mg (Cognizin trials); 1,000 mg in one older trial
Healthy-adult evidence	Small, mostly maker-funded trials; mixed results for attention and exercise	Three small trials run with the Cognizin brand owner; the largest missed its main outcome
Head-to-head trials in healthy people	None found	None found
Growth hormone	A rise after 1,000 mg in one study of 8 men; no change in a 20-man trial at 315 or 630 mg	We found no studies
Cost per 100 mg of choline	Lower than citicoline	Higher (also supplies cytidine)

When to Choose Each

Choose Alpha-GPC when:

You want more choline per milligram of the two (about 40% vs 20%)
You are interested in the small exercise trials, which show mixed results
You are under 50 with no heart or stroke risk factors, or your doctor has cleared it

Choose Citicoline when:

You want the form used in a 12-week trial in 100 older adults with everyday memory complaints (500 mg a day of Cognizin), which improved secondary memory scores but not its main outcome
You want cytidine, which the body converts to uridine, along with choline
You are fine paying more per milligram of choline

Verdict

Alpha-GPC gives about twice the choline per milligram of citicoline (about 40% vs 20% by weight). Citicoline also supplies cytidine, which the body turns into uridine. Each has a handful of small, mostly industry-funded trials in healthy adults with modest, inconsistent results, and we found no trial comparing them directly. In large hospital drug trials, citicoline did not help patients after acute stroke or brain injury, and a Korean records study of people 50 and older linked prescription alpha-GPC with more strokes, though it cannot show cause. If you mainly want to meet your choline needs, a choline salt costs far less; see our ranking of the best choline supplements. For what each citicoline trial found, see our citicoline evidence review.

Frequently Asked Questions

Which works faster?

We found no trial comparing them directly. In single-dose alpha-GPC studies, one sponsor-funded trial found a better score on one of three thinking tests about an hour after a dose and another found no effect. Citicoline was mostly studied over 4 to 12 weeks. Neither has a proven same-day effect.

Should I take alpha-GPC before workouts?

The evidence is thin. Growth hormone rose after 1,000 mg in one study of 8 men and after 600 mg in a 7-man conference poster, while a 20-man trial at 315 or 630 mg found no change. Strength and power results are mixed, and most of these studies were funded by alpha-GPC makers. The citicoline research we reviewed focused on attention and memory, not exercise.

Can I take both?

We found no studies of the two taken together. Both supply choline: 300 mg of alpha-GPC gives about 120 mg of choline and 250 mg of citicoline about 50 mg, well below the adult upper limit of 3,500 mg of choline a day. Neither has pregnancy safety data.

Are there side effects?

Both caused few side effects in short trials; heartburn, nausea, headache and insomnia have been reported with alpha-GPC. A Korean records study of 12 million people aged 50 and older linked prescription alpha-GPC with about 40% higher stroke risk. Users were older and sicker, the study recorded how long people took it rather than the dose, and it cannot show cause. If you are over 50 or have heart or stroke risk factors, talk to your doctor first. Citicoline caused few reported problems in hospital trials at 2,000 mg a day, though a Cochrane review said harms were poorly reported; if you take Parkinson's medicines, ask your doctor first. Neither has pregnancy safety data.

Disclaimer: This comparison is for informational purposes only and does not constitute medical advice. Individual responses to supplements vary. Always consult a healthcare provider before starting any supplement regimen, especially if you have a medical condition or take prescription medications.