MitoGenix Guides
Alpha-GPC: What the Research Shows
Quick answer
Alpha-GPC and citicoline (CDP-choline) are different forms of choline, and no trial reviewed here compared them head to head, so there is no evidence that one gives “more” cognitive benefit. Alpha-GPC has the most research in older adults with cognitive impairment. In healthy adults the evidence for focus is small and mixed, and the exercise studies are small, short and mostly supplier-funded.
A large observational study also linked Alpha-GPC use with a higher stroke risk in adults over 50. If you are over 50 or have cardiovascular risk factors, speak to a healthcare professional first. Details below.
Searches for Alpha-GPC in South Africa mostly ask the same things: what it is, what dose to take, and how it compares with citicoline. This guide covers each, and is blunt about how much of the research was done in people who are not like most supplement buyers.
What Alpha-GPC is
Alpha-GPC (L-alpha-glycerylphosphorylcholine) is a form of choline. Choline is an essential nutrient the body uses to make acetylcholine, a neurotransmitter involved in attention and memory. Alpha-GPC carries about 40% choline by weight, which is why capsule labels should state both the raw-material strength and the amount of Alpha-GPC actually delivered. Ours does: 250 mg of Alpha-GPC per capsule, from a 50% raw material.
Alpha-GPC and citicoline
Both supply choline, but they are different molecules. Citicoline (CDP-choline) carries about 18% choline and also supplies cytidine, which the body uses in making cell membranes. Neither is simply a stronger or weaker version of the other, and no trial reviewed here compared them head to head.
What the research found
| Study | Who and what | What it reported |
|---|---|---|
| Sagaro et al., 2023 [1] | Meta-analysis of 8 studies, 861 adults aged 50+ with cognitive impairment (Alzheimer's, vascular disease, dementia). | Benefits on some cognitive scores, mostly when Alpha-GPC was added to prescription medication. Results varied widely between studies and several were at unclear risk of bias. |
| Moreno, 2003 [2] | 261 people with mild to moderate Alzheimer's, Alpha-GPC or placebo three times daily for 180 days. | Cognitive scores improved with Alpha-GPC and worsened with placebo. A single older trial in people with dementia. |
| Tamura et al., 2021 [4] | 39 healthy adults, 400 mg a day or placebo for 2 weeks, single-blind pilot. | A trend toward higher motivation overall. Only the night-time rating was significant. |
| Kerksick, 2024 [3] | 20 resistance-trained men, single 315 mg or 630 mg dose, crossover. | Better Stroop-test scores after both doses. No difference on other cognitive tests. Funded by the raw-material supplier. |
| Bellar et al., 2015 [5] | 13 young men, 600 mg a day for 6 days, crossover. | Greater lower-body isometric force than placebo. Small study, funded by an ingredient supplier. |
| Marcus et al., 2017 [6] | 48 healthy young men, 250 mg or 500 mg a day for 7 days. | No difference in strength or psychomotor vigilance. Some jump measures differed, best at 250 mg. Funded by an ingredient supplier. |
| Harrington, 2023 [7] | 30 trained male cyclists, Alpha-GPC combined with BCAAs and L-citrulline for 7 days. | Higher peak power and time to fatigue, but the effect cannot be attributed to Alpha-GPC alone. |
What this adds up to
- In older adults with cognitive impairment, Alpha-GPC has the most research, and the results lean positive but vary a lot.
- In healthy adults, the evidence is small, short and mixed. An independent 2020 rating from the Alzheimer's Drug Discovery Foundation found no studies of cognitive benefit in healthy people at that time [8], and the 2024 trial since then used single doses in 20 men.
- On exercise, a few small studies suggest effects on force and power, but they are small, short and mostly supplier-funded. Treat that as preliminary.
- On safety, a large observational study in adults over 50 found a higher stroke rate among people prescribed Alpha-GPC. That shows an association, not proven cause, and it is covered in the FAQ below [10].
How the doses compare with the label
| Source | Alpha-GPC |
|---|---|
| Kerksick 2024 (single dose) | 315 mg and 630 mg |
| Tamura 2021 (daily, 2 weeks) | 400 mg |
| Marcus 2017 (daily, 7 days) | 250 mg and 500 mg |
| Bellar 2015 (daily, 6 days) | 600 mg |
| MitoGenix Alpha-GPC, standard serving | 250 mg (1 capsule) |
| MitoGenix Alpha-GPC, enhanced serving | 500 mg (2 capsules) |
The standard serving sits at the low end of the doses studied, and the enhanced serving inside the middle of that range. That is a dose comparison only. It is not a claim that this product was tested.
How to use it sensibly
- Follow the label: one capsule daily as the standard serving, or two capsules daily for a heavier workload or greater body mass. Do not exceed two capsules a day.
- Timing: the label sets no fixed time, and it can be taken with or without food.
- Count other sources. Mito-Focus Xtreme already contains 250 mg of Alpha-GPC per serving, so taking both adds the amounts together.
- Possible side effects include stomach upset, heartburn, headache and restlessness, more likely at higher doses. The independent rating found few safety studies and no large, long-term ones [8], so check with a healthcare professional if you are unsure.
Who it's not for
Alpha-GPC is not intended for:
- anyone under 18
- pregnant or breastfeeding women
If you are over 50, have cardiovascular risk factors, take prescription medication (it acts on the acetylcholine system) or have a known medical condition, speak to a healthcare professional first. Stop use if you get any adverse reaction.
Frequently asked questions
How much Alpha-GPC is in one capsule?
250 mg of Alpha-GPC per capsule, from a 50% Alpha-GPC raw material, with 60 capsules per jar.
How long does it take to work?
There is no set timeline. Trials used single doses 30 to 60 minutes before testing, and daily use for one to two weeks, with mixed results. Take it consistently as directed.
Alpha-GPC vs CDP-choline (citicoline): which provides more cognitive benefit?
There is no trial evidence that one beats the other. They are different molecules: Alpha-GPC carries about 40% choline by weight, while citicoline carries about 18% and also supplies cytidine. A common online claim is that Alpha-GPC suits physical performance and citicoline suits mental tasks, but that is opinion, not a trial result. No study reviewed here compared them directly, and the evidence for each in healthy adults is limited.
Does Alpha-GPC improve mental focus or physical performance?
The evidence is limited and mixed. For mental performance, an independent 2020 rating found no cognitive-benefit studies in healthy people at that time [8]; a 2024 trial in 20 men found better Stroop-test scores after single doses but no difference on other tests [3], and a 2021 pilot found only a trend toward higher motivation [4]. For physical performance, one 6-day study found greater isometric force [5] while another found no strength difference [6]. These are small, short studies, several funded by ingredient suppliers, so treat them as preliminary.
Is Alpha-GPC safe? What about the stroke-risk study?
A South Korean study of about 12 million adults aged 50 and over (Lee et al., JAMA Network Open, 2021) found that people prescribed Alpha-GPC had a higher rate of stroke over the following 10 years than non-users, and the association was stronger with longer prescriptions [10]. It is an observational study, so it shows an association, not proven cause. The users were older and were prescribed it by doctors, most likely for existing cognitive complaints, and the authors called for further research. It did not study healthy younger adults taking a daily supplement. If you are over 50 or have cardiovascular risk factors such as high blood pressure, heart disease or a previous stroke, speak to a healthcare professional before using Alpha-GPC.
Can I take Alpha-GPC with Mito-Focus Xtreme?
Mito-Focus Xtreme already provides 250 mg of Alpha-GPC per serving, so you would be doubling up. Count both toward your daily total.
Does it have caffeine?
No. It has one active ingredient. Your caffeine intake stays your own choice.
Where to find it
MitoGenix Alpha-GPC is a single-ingredient capsule with the dose declared on the label, made in a GMP-certified facility in South Africa and independently tested. Alpha-GPC is also one of five actives in Mito-Focus Xtreme, which our guide Nootropic Stack for Focus explains dose by dose.
References
- Sagaro GG, Traini E, Amenta F. Activity of choline alphoscerate on adult-onset cognitive dysfunctions: a systematic review and meta-analysis. 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10041421/
- Moreno MDJM. Cognitive improvement in mild to moderate Alzheimer's dementia after treatment with the acetylcholine precursor choline alfoscerate: a multicenter, double-blind, randomized, placebo-controlled trial. Clin Ther, 2003. https://pubmed.ncbi.nlm.nih.gov/12637119/
- Kerksick CM. Acute alpha-glycerylphosphorylcholine supplementation enhances cognitive performance in healthy men. Nutrients, 2024. https://pubmed.ncbi.nlm.nih.gov/39683633/ (funded by the raw-material supplier)
- Tamura Y, Takata K, Matsubara K, Kataoka Y. Alpha-glycerylphosphorylcholine increases motivation in healthy volunteers: a single-blind, randomized, placebo-controlled human study. Nutrients, 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC8235064/
- Bellar D, LeBlanc NR, Campbell B. The effect of 6 days of alpha glycerylphosphorylcholine on isometric strength. J Int Soc Sports Nutr, 2015. https://pubmed.ncbi.nlm.nih.gov/26582972/ (funded by an ingredient supplier)
- Marcus L, Soileau J, Judge LW, Bellar D. Evaluation of the effects of two doses of alpha glycerylphosphorylcholine on physical and psychomotor performance. J Int Soc Sports Nutr, 2017. https://pubmed.ncbi.nlm.nih.gov/29042830/ (funded by an ingredient supplier)
- Harrington RN. Effects of branched chain amino acids, L-citrulline, and alpha-glycerylphosphorylcholine supplementation on exercise performance in trained cyclists: a randomized crossover trial. J Int Soc Sports Nutr, 2023. https://pubmed.ncbi.nlm.nih.gov/37229544/
- Cognitive Vitality (Alzheimer's Drug Discovery Foundation). Alpha-GPC / choline alfoscerate rating, updated 2020. https://www.alzdiscovery.org/cognitive-vitality/ratings/alpha-gpc-choline-alfoscerate
- National Institutes of Health, Office of Dietary Supplements. Choline: fact sheet for health professionals. https://ods.od.nih.gov/factsheets/Choline-HealthProfessional/
- Lee G, Choi S, Chang J, et al. Association of L-α glycerylphosphorylcholine with subsequent stroke risk after 10 years. JAMA Netw Open, 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC8613599/
This health supplement is not intended to diagnose, treat, cure or prevent any disease. This unregistered medicine has not been evaluated by SAHPRA for its quality, safety or intended use. Health supplements are intended only to complement your diet.
