Comparing two supplements
This is written by a seller, applied to its own product, and it reaches an inconvenient answer. That is the test of a method: it has to be allowed to.
Compare cost per studied dose, not cost per bottle or cost per capsule. Work out what one serving delivers, how many servings reach the studied dose, and what that costs per day.
Most of this category fails at step one, because a proprietary blend makes the calculation impossible.
The question that eliminates most of the shelf
Can you find out how many milligrams of each active you are getting? If not, you cannot compare the product with anything — including a cheaper version of itself.
A proprietary blend gives a total and an ingredient list in descending order. From that you can derive a ceiling for each position, which is useful, and you can never derive a dose, which is what you need for a comparison.
VapoCept passes this step, which most of its competition does not. Every figure is published. That is worth saying at the top of a page that is about to be unflattering.
If one of your two candidates uses a blend and the other does not, you already have an answer of a kind: only one of them is willing to be measured.
Cost per studied dose
This is the calculation, and it takes about two minutes per product.
- Convert the declared amount to base weight if it is a salt.
- Find the lowest published dose at which an effect has been reported for the outcome you want.
- Divide: studied dose ÷ per-serving delivery = servings needed per day.
- Multiply by cost per serving. That is your cost per studied dose per day.
- Repeat for the other product.
- Compare those two numbers, not the two prices on the front.
Worked on this product's citrulline, at the six-bottle price: one capsule delivers 155 mg of citrulline and costs $1.63. Reaching 2.4 g takes 15.5 capsules, so a studied dose of citrulline from this product costs about $25 a day.
That figure is not a criticism of the pricing, because nobody would take 15.5 capsules. It is the point of the exercise: it converts a vague sense that a dose is low into a number you can put next to another number.
Why the lowest dose, and not the average
Because you are testing the best case. If a product cannot reach the lowest dose anyone has reported an effect at, the average is irrelevant. If it can, then you go and look at the average.
Step three: check the evidence is for what you want
A correct dose of something studied for the wrong thing is still the wrong thing, and this is where supplement marketing does most of its work.
| Level | What it is | How much weight |
|---|---|---|
| Systematic review or meta-analysis of human trials | Many trials, pooled and assessed | The most, when the trials are decent |
| Randomised controlled trials in humans, on your outcome | The individual studies | Substantial, especially if replicated |
| Randomised trials in humans, on a different outcome | Common in this category | Relevant to safety and dose, not to your question |
| A single small trial | One study, often industry-funded | Some, and treat a single positive result cautiously |
| A subgroup finding inside a trial | An effect in part of the sample only | Weak on its own, and worth reporting honestly |
| Animal or cell studies | Mice, or cells in a dish | Mechanistic interest only |
| Nothing | No human trial exists | None |
Scroll this table sideways →
The third row is the one to watch. This label's citrulline evidence is a cycling time trial; its beta-alanine performance evidence is muscle carnosine loading. Both are real human trials and neither is about memory.
The fifth row applies too: the one positive cognitive beta-alanine result is a subgroup finding in older adults who started below normal. We use it as the benchmark because it is the most generous one available, and we say what it is.
Questions that feel useful and are not
- How many ingredients does it have? In a capsule with a fixed fill, more ingredients means less of each. Ingredient count is an argument against a formula, not for it.
- Is it natural? Undefined, and irrelevant to whether it works. Purified amino acids are what the research used.
- Does it have a GMP seal? Useful, and it certifies a facility rather than a formula.
- What do the reviews say? The weakest evidence in this category and the easiest to manufacture.
- Is it doctor formulated? Which doctor? If the answer is not on the page, the phrase carries no information.
- Is it expensive? Price carries almost no information about content here. Run the arithmetic instead.
Every one of those six appears on product pages as a selling point, including on sites like this one. None of them survives step one.
What to do instead
- Pick the one or two substances with the best human evidence for what you actually want.
- Buy them individually, at a disclosed dose, in the form the trials used.
- Compare cost per studied dose rather than per bottle.
- Run one change at a time for the length of the trials.
- Write down a baseline before you start, and read your notes rather than your memory at the end.
- Before any of the above, deal with sleep, hearing, blood pressure and a medication review. Every one of them has a larger evidence base for cognition than anything in this category.
That last point is the honest one, which is why it is last rather than buried. A seller's site is an odd place to read it and it is still true.
This method, applied here →Who this product suits →The ingredient list →
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.