The capsule count
This is the page this site exists for, and it is the simplest one we have ever had to write. The label publishes every figure. The trials publish theirs. The rest is division.
Reaching the lowest published dose of each amino acid on this label would take about 10 capsules a day for arginine, 16 for citrulline and 60 for beta-alanine. The label says one.
A whole 30-capsule bottle holds about 3.1 days of the studied arginine dose, 1.9 days of citrulline and 0.5 days of beta-alanine.
Why this page is short on assumptions
The four labels we assessed before this one all used a proprietary blend. Every one of those pages had to work indirectly: derive a ceiling from the descending-order rule, grant the manufacturer's own extract ratios, and show that even the most generous reading fell short. It worked, and it was hard to read.
This label needs none of that. It prints a milligram figure beside every ingredient, which is exactly what a buyer should want and exactly what this category usually withholds. So there is nothing to bound, nothing to infer and nothing to argue about. There is only the number the seller published and the number the study used.
Three choices, all of them in the product's favour
The salt arithmetic is granted in full. Where the label declares a salt, we credit the product with every milligram of amino acid inside it, using molecular weights from the NIST Chemistry WebBook.
The citrulline malate is taken at its nominal 2:1. Published NMR analysis has found commercial material missing its stated ratio, most near 1.6:1 and some as low as 1.1:1. We use the best case.
The target is the lowest dose in the literature, not a typical one. Where a range exists, the bottom of it is used, and where two trials disagree we use the one that asked less of the product.
If the conclusion survives all three, it is not a conclusion about how we chose to measure.
The chart
This is not an estimate. The label publishes a milligram figure for every ingredient, so there is nothing to infer: the only arithmetic here is a division, and both numbers going into it are printed — one by the seller, one by the study.
studied at 3.32 g a day — 1.66 g twice daily10 capsules a day to reach it. The label says one.9.7×short of the lowest
dose we could cite
studied at 2.4 g a day for seven days16 capsules a day to reach it. The label says one.15.5×short of the lowest
dose we could cite
studied at 2.4 g a day for ten weeks60 capsules a day to reach it. The label says one.60.0×short of the lowest
dose we could cite
A bottle holds 30 capsules. Measured against the lowest studied daily dose of each substance, that whole bottle is 3.1 days of L-arginine, 1.9 days of L-citrulline, 0.5 days of Beta-alanine.
The beta-alanine figure is the one to sit with: a full thirty-day bottle holds less than one studied day of it.
The glyphs are the point. A bar chart would compress sixty capsules into a rectangle you could read past; sixty separate capsules is harder to look away from, and it is the honest picture of what the arithmetic says.
Arginine, in full
The label declares two arginine entries totalling 400 mg: 200 mg of the free base, and 200 mg of an arginine alpha-ketoglutarate marked 2:1. The base entry delivers 200 mg of arginine. The AKG entry does not, because roughly three tenths of its weight is the acid.
| Entry | Declared | Fraction that is arginine | Arginine delivered |
|---|---|---|---|
| L-Arginine, base | 200 mg | 100% | 200.0 mg |
| L-Arginine AKG 2:1 | 200 mg | 70.5% | 140.9 mg |
| Total | 400 mg | — | 340.9 mg |
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Now the comparison. The only trial we could find that gave oral arginine and measured a cognitive endpoint used 1.66 g twice daily — 3.32 g a day — for four weeks in 72 frail hypertensive adults averaging 77 years old, and reported a difference in MoCA score against placebo. Against 340.9 mg, that is 9.7 capsules a day.
It is worth adding a second source, because it is blunter than we would be. A 2007 review of arginine pharmacodynamics in the Journal of Nutrition states that “daily doses below 2 to 3 g/d appear to be without beneficial effect”. Even taking the lower end of that as a floor, this label sits at about a sixth of it.
And a third, which cuts the other way and belongs here anyway: a 2022 dose–response meta-analysis of arginine and blood pressure found significance only at 4 g a day and above, with the effect lost above 9 g. Arginine is not a substance where more is always better. It is a substance where this label's amount is below the bottom of every window anyone has reported.
Absorption runs the wrong way
A reasonable objection is that milligrams swallowed are not milligrams absorbed, and perhaps this formula absorbs unusually well. For oral arginine specifically the literature points the other way: a 2008 pharmacokinetic study describes arginine treatment as “hampered by extensive presystemic elimination due to intestinal arginase activity”. Less arrives than was swallowed, not more.
Citrulline, in full
The same pattern, at half the weight. Two entries totalling 200 mg: 100 mg of citrulline hydrochloride and 100 mg of citrulline malate.
| Entry | Declared | Fraction that is citrulline | Citrulline delivered |
|---|---|---|---|
| L-Citrulline HCl | 100 mg | 82.8% | 82.8 mg |
| L-Citrulline Malate, at the nominal 2:1 | 100 mg | 72.3% | 72.3 mg |
| Total, best case | 200 mg | — | 155.1 mg |
| The same, if the malate is really 1.1:1 | — | — | 141.7 mg |
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That last row is not us being difficult. A 2021 critical review of citrulline malate reports NMR analysis showing that “many CM manufacturers failed to reach the purported ratios”, with most landing near 1.6:1 and some as low as 1.1:1. This label does not state its ratio at all, so the honest figure is a range, and we use the top of it everywhere else on this site.
The comparison: the lowest oral citrulline dose with a reported effect that we could open is 2.4 g a day for seven days, in a cycling time-trial study in 22 trained men. Against 155.1 mg, that is 15.5 capsules a day.
We should be straight about what that trial measured. It is a performance study, not a cognition study. We looked for a peer-reviewed human trial of citrulline on cognitive outcomes and could not find one; the only human work we located is a postgraduate thesis at 1.5 g a day in 16 people, which reported no statistical significance against placebo. So the citrulline row on the chart is measured against the wrong endpoint, because the right endpoint has no trial behind it.
Why citrulline is on this label at all
There is a real reason, and it is a point in the formulator's favour. A 2008 study found that oral citrulline raised plasma arginine more effectively than oral arginine itself, which is the sensible argument for including it in an arginine formula. That study used 3 g twice a day.
Beta-alanine, in full
Forty milligrams. This is the clearest row on the chart and the hardest to soften.
The International Society of Sports Nutrition position stand on beta-alanine describes 4 to 6 g daily for at least two to four weeks to load muscle carnosine, and its list of conclusions contains no cognitive claim at all. That is a performance dose for a performance outcome.
There is a cognitive literature, and it is worth reporting accurately because it is not empty and it does not agree with itself. A 2015 exploratory trial gave 6.4 g a day for 28 days and found no effect on response times or accuracy across three cognitive tasks. A 2023 trial in 100 older adults gave 2.4 g a day for ten weeks and found a MoCA improvement only in the subgroup who started below 27.
We use the 2.4 g figure, because it is the lowest cognitive dose anyone has reported an effect at, and because using the 6.4 g null result would be choosing the number that makes the product look worse. Against 40 mg, 2.4 g is 60 capsules a day.
Put the other way: a whole thirty-capsule bottle contains 1.2 g of beta-alanine, which is half of one studied daily dose. Not half a course. Half of one day.
A caveat the product deserves
The 2023 result is a subgroup finding in older adults with below-normal baseline scores. It is genuine, it is published, and a single subgroup result is not the same as an established effect. We are using it as the benchmark because it is the most generous benchmark available, not because we think it settles anything.
The two nutrients, measured properly
Niacin and calcium do not belong on the capsule chart, because a nutrient is measured against a Daily Value rather than against a trial dose. Running them together would be comparing unlike things, so they get their own table.
| Line | Per capsule | % Daily Value | The Daily Value | What to notice |
|---|---|---|---|---|
| Niacin | 7.5 mg NE | 47% | 16 mg NE | A real nutrient dose. Just under half a Daily Value, and the one line on this label that needs no argument. |
| Calcium as Calcium Carbonate | 18 mg | 1% | 1,300 mg | One point four per cent of a Daily Value. You would need 72 capsules to reach one. |
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The niacin line is the single best thing on this label. 7.5 mg NE against a Daily Value of 16 mg NE is 47% of a day's intake, which is a real and defensible amount of an established nutrient. Nothing on this site argues with it.
The calcium line is a different matter. Eighteen milligrams is 1.4% of a Daily Value — you would need 72 capsules to reach one — and calcium carbonate is a material with a well-documented second job. A 2023 review describes it as “a safe excipient traditionally used as a diluent for directly compressible tablets”, with roles as a diluent and a bulking agent. We cannot tell you it is in this capsule as a filler. We can tell you that 1.4% of a Daily Value is not a nutritional contribution, and that declaring it adds a line to the panel.
The bottle, not the capsule
Capsules-per-day is one framing. Here is the other, which some people find lands harder: how long does one bottle last, measured in studied doses rather than in days?
| Substance | In a whole bottle | Lowest studied daily dose | Days of that dose |
|---|---|---|---|
| L-arginine | 10.23 g | 3.32 g | 3.1 |
| L-citrulline | 4.65 g | 2.40 g | 1.9 |
| Beta-alanine | 1.20 g | 2.40 g | 0.5 |
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A thirty-day bottle that contains three days of one ingredient, two days of another and half a day of a third. That is the formula, stated in the seller's own published milligrams, with no interpretation applied to it at all.
The six-bottle pack costs $294 and contains 180 capsules. Measured the same way, that is about 18 days of the studied arginine dose, 12 days of citrulline and 3 days of beta-alanine.
What would change this page
- A trial of this finished formula. If VapoCept at one capsule a day has been tested against placebo on a cognitive endpoint, that result outranks every dose comparison on this page and we would lead with it.
- A photographed Supplement Facts panel showing different figures from the brief. Every number here is the seller's; if the seller's own document disagrees, the document wins.
- The molar ratio of the citrulline malate, if it is higher than 2:1.
- A human trial at a dose in this range. If anyone publishes an effect from 341 mg of arginine or 40 mg of beta-alanine, the relevant row changes the week we read it.
- An absorption study of this formula showing plasma levels comparable to a gram dose. This is the one that would genuinely overturn the argument, and it is the one we would most like to see.
Send any of those to the editorial inbox and the page changes with the date on it. We would rather be corrected with a document than be right because nobody checked.
The molar arithmetic →Every line, one at a time →The claim on the front →
See the VapoCept packs
Two, three or six bottles, priced plainly, with a 60-day window that runs from purchase. Read the capsule count first, then decide.
Shipping is calculated at checkout. This site publishes no figure it was not given.
References
Every source below was opened and read during this build. Nothing here cites a study we did not read, and no identifier on this site was written from memory. Where a claim could not be verified, the page says so instead of using it.
- U.S. Government Publishing Office21 CFR 101.93 — Certain types of statements for dietary supplements — eCFR.gov · source
- U.S. Food and Drug AdministrationSmall Entity Compliance Guide on Structure/Function Claims — FDA.gov · source
- U.S. Food and Drug Administration — 2000Regulations on Statements Made for Dietary Supplements Concerning the Effect of the Product on the Structure or Function of the Body, final rule — 65 Federal Register 1000 · 65 FR 1000 · source
- U.S. Food and Drug AdministrationGuidance for Industry: Substantiation for Dietary Supplement Claims Made Under Section 403(r)(6) — FDA.gov · source
- U.S. Food and Drug AdministrationQuestions and Answers on Dietary Supplements — FDA.gov · source
- U.S. Federal Trade Commission — 2022Health Products Compliance Guidance — FTC.gov · source
- National Institute on AgingCognitive Health and Older Adults — NIA.NIH.gov · source
- National Center for Complementary and Integrative HealthDietary Supplements and Cognitive Function, Dementia, and Alzheimer’s Disease: What the Science Says — NCCIH.NIH.gov · source
- U.S. Food and Drug AdministrationDaily Value on the Nutrition and Supplement Facts Labels — FDA.gov · source
- NIH Office of Dietary SupplementsNiacin — Health Professional Fact Sheet — ods.od.nih.gov · source
- NIH Office of Dietary SupplementsCalcium — Health Professional Fact Sheet — ods.od.nih.gov · source
- Böger — 2007The Pharmacodynamics of L-Arginine — The Journal of Nutrition · DOI 10.1093/jn/137.6.1650S · source
- Shiraseb, Asbaghi, Bagheri, Wong, Figueroa, Mirzaei — 2022Effect of L-Arginine Supplementation on Blood Pressure in Adults: a systematic review and dose–response meta-analysis — Advances in Nutrition · DOI 10.1093/advances/nmab155 · PMID 34891179 · source
- Mone, Pansini, Jankauskas et al. — 2022L-Arginine Enhances the Effects of Cardiac Rehabilitation on Physical Performance: new insights for managing cardiovascular patients during the COVID-19 pandemic — Frontiers in Cardiovascular Medicine · DOI 10.3389/fcvm.2022.868521 · source
- Schwedhelm, Maas, Freese et al. — 2008Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine: impact on nitric oxide metabolism — British Journal of Clinical Pharmacology · DOI 10.1111/j.1365-2125.2007.02990.x · PMID 17662090 · source
- Campbell, Roberts, Kerksick et al. — 2006Pharmacokinetics, safety, and effects on exercise performance of L-arginine α-ketoglutarate in trained adult men — Nutrition, volume 22 · source
- National Library of MedicineL-Arginine alpha-ketoglutarate 2:1 — PubChem CID 76045315, formula C17H34N8O9 — PubChem · CID 76045315 · source
- Suzuki, Morita, Kamimura, Miyazawa — 2016Oral L-citrulline supplementation enhances cycling time trial performance in trained male cyclists — Journal of the International Society of Sports Nutrition · DOI 10.1186/s12970-016-0117-z · source
- Schierbauer et al. — 2025Effects of L-citrulline supplementation on exercise capacity in healthy young adults — Frontiers in Sports and Active Living · DOI 10.3389/fspor.2025.1627743 · source
- Gough, Sheeran, Shave, Waldron, Jeffries — 2021A critical review of citrulline malate supplementation and exercise performance — European Journal of Applied Physiology · DOI 10.1007/s00421-021-04774-6 · PMID 34417006 · source
- Trexler, Smith-Ryan, Stout et al. — 2015International Society of Sports Nutrition position stand: Beta-Alanine — Journal of the International Society of Sports Nutrition · DOI 10.1186/s12970-015-0090-y · PMID 26175657 · source
- Solis, Cooper, Hobson et al. — 2015Effects of beta-alanine supplementation on brain homocarnosine/carnosine signal and cognitive function: an exploratory study — PLOS ONE · DOI 10.1371/journal.pone.0123857 · PMID 25875656 · source
- Ostfeld, Ben-Zeev, Zamir et al. — 2023Effect of Beta-Alanine Supplementation on Cognitive Function in Older Adults — Nutrients, volume 15 · DOI 10.3390/nu15040923 · PMID 36839281 · source
- Shafqat — 2016The effect of L-citrulline supplementation on mood and cognition — a postgraduate thesis, not a peer-reviewed trial — Queen Margaret University eResearch · source
- Ambrogi et al. — 2023A New Challenge for the Old Excipient Calcium Carbonate — Pharmaceutics · DOI 10.3390/pharmaceutics15010300 · source
- National Institute of Standards and TechnologyArginine — C6H14N4O2, 174.2010 g/mol — NIST Chemistry WebBook · source
- National Institute of Standards and Technology2-Oxopentanedioic acid — C5H6O5, 146.0981 g/mol — NIST Chemistry WebBook · source
- National Institute of Standards and TechnologyCitrulline — C6H13N3O3, 175.1857 g/mol — NIST Chemistry WebBook · source
- National Institute of Standards and TechnologyHydrogen chloride — ClH, 36.461 g/mol — NIST Chemistry WebBook · source
- National Institute of Standards and TechnologyMalic acid — C4H6O5, 134.0874 g/mol — NIST Chemistry WebBook · source
- National Institute of Standards and Technologybeta-Alanine — C3H7NO2, 89.0932 g/mol — NIST Chemistry WebBook · source
Who made and checked this VapoCept page
Written from the seller’s panel, the front of the bottle and the sources cited on the page, then reviewed before publication. It is general information for adults and does not replace a conversation with your own clinician.
If your memory or concentration is changing, or you are on medicine for blood pressure or the heart, the first conversation is with your clinician, before the first VapoCept capsule.