Memodyne Official Website › How It Works
How It WorksHow Memodyne is supposed to work, step by step
Four of the six names feed one chain: arginine to nitric oxide to wider blood vessels.
The chain is real chemistry at every step and the ingredient choice is sensible, because two of the four are citrulline, which survives digestion better than arginine does. Where the case thins is at the far end: the single trial that measured cerebral blood flow used 8.8 g a day in young athletes, and no amount is published for this capsule.
The mechanism the seller describes, followed in order, with the two steps that carry the weight and the two that do not.
The chain Memodyne is built on
Nitric oxide is a gas the body makes on purpose. It is produced inside the endothelial cells that line every blood vessel, it diffuses a very short distance into the smooth muscle around the vessel, and it tells that muscle to relax. A relaxed vessel is a wider vessel and a wider vessel carries more blood at lower pressure.
The raw material for it is arginine. Give the body more arginine and, in principle, it makes more nitric oxide. That is the entire premise of four of the six names on this label, and a 2019 review of oral arginine and citrulline supplementation sets out how well it holds up for blood pressure.
Arginine goes in, and most of it does not arrive
Arginine taken by mouth meets arginase in the gut wall and again in the liver. The stable-isotope study followed a single labelled arginine meal through human metabolism and found the dominant fate was urea synthesis rather than nitric oxide. This is the reason plain arginine is the weakest of the four names here.
Citrulline takes the route arginine cannot
Citrulline is absorbed intact, passes the liver untouched and is converted to arginine in the kidney. A human availability study raised circulating citrulline directly at 0.18 g per kg a day, and a 2026 pharmacokinetic model quantified the conversion step. Giving both together raised plasma arginine faster than either alone, which is an argument for a formula that carries both, as this one does.
Nitric oxide is produced, locally and briefly
It has a half-life measured in seconds and works where it is made. That is by design — a local signal rather than a circulating hormone — but it means the effect follows the supply rather than building on it. There is no reservoir to fill.
The vessels widen, and blood pressure moves a little
This step has the best evidence of the four. A 2025 meta-analysis of citrulline supplementation and watermelon intake in middle-aged and older adults found a measurable reduction in blood pressure, and a review of citrulline in older adults covers the vascular and muscular side of the same literature.
And then a cognitive outcome has to follow
This is where the chain stops being a chain and becomes a hope. One trial has measured cerebral blood flow after citrulline, in twenty young male athletes at 8.8 g a day for five days, and it measured a breath-holding index rather than memory. Nobody has run the equivalent study in sixty-year-olds at a capsule dose, and nobody has run any study of this product.
Where niacin and calcium sit in the Memodyne formula
Niacin: the energy half
The body converts niacin into NAD and NADP, the two coenzymes that carry electrons through the reactions that release energy from food. Brain tissue is metabolically expensive and uses a disproportionate share of the body's energy budget, so the link is not fanciful.
The cognitive evidence is observational. The Chicago Health and Aging Project followed dietary niacin intake against incident Alzheimer's disease and cognitive decline, and a 2025 analysis found similar associations across B vitamins generally. Diet studies describe populations; they do not test supplements.
Calcium carbonate: the outlier
It is not part of the nitric-oxide chain and it is not part of the energy chain. It is the cheapest and densest form of supplemental calcium, and it is the reason this label's timing instruction is worth a second look.
Its one randomised look at cognition, the Perth analysis, found nothing in either direction across fourteen and a half years. That is a reassuring result rather than a supportive one, and this page prints it as the former.
What would have to be true for Memodyne to work as described
- The capsule would have to carry enough citrulline to raise plasma arginine meaningfully. Published trials use grams; a capsule holds a fraction of a gram across six ingredients.
- The resulting nitric oxide would have to reach cerebral vessels specifically, rather than the larger peripheral ones where most of the blood-pressure effect is measured.
- Wider cerebral vessels would have to translate into a measurable cognitive difference in somebody whose memory is ordinarily age-affected rather than impaired.
- And that difference would have to be large enough to notice against the day-to-day variation in anyone's attention, sleep and mood.
None of those four is impossible and none of them has been demonstrated for this product. That is the state of the evidence, printed plainly, and it is why this shop sells the capsule as a daily routine rather than as a result.
What has actually been shown to help, next to Memodyne
| Intervention | Evidence | What it found |
|---|---|---|
| Treating hearing loss | ACHIEVE, a multicentre randomised trial | A hearing intervention against health education in older adults with hearing loss, with cognitive decline as the outcome |
| Treating blood pressure intensively | SPRINT MIND | Intensive versus standard blood-pressure control, with probable dementia as the outcome |
| A daily multivitamin | COSMOS-Web and COSMOS-Mind | Small memory improvements in older adults from a plain daily multivitamin |
| Sleep | A 2026 review | The consolidation of memory during sleep, which is not a supplement question at all |
None of these four is sold on this website, and all four are printed here because a buyer weighing this purchase deserves to know what the alternatives look like.
The fourth row is the awkward one for a shop, and it is also the cheapest thing on the list. It is in one of the five bonus downloads that ship free with two of the three packs.
How Memodyne works: common questions
What does Memodyne actually do in the body?
Four of its six names raise the supply of arginine, which the body converts into nitric oxide, which relaxes blood-vessel walls. Niacin becomes NAD and NADP, the coenzymes of energy metabolism. Calcium carbonate is a mineral salt and is not part of either chain.
Is the nitric-oxide mechanism real?
Yes, and it is not controversial. What is unsettled is whether it produces a cognitive result at the amounts a six-ingredient capsule can hold, which is a different question and has no trial behind it for this product.
Why does the formula use citrulline as well as arginine?
Because oral arginine is largely broken down before it reaches general circulation, and citrulline is not. Citrulline is absorbed intact and converted to arginine by the kidney, so it raises plasma arginine more reliably than arginine itself does.
Has anyone measured blood flow in the brain after citrulline?
Once, in the record this page cites. Twenty male taekwondo athletes aged eighteen to thirty took 8.8 g a day for five days and their breath-holding index improved after sprint intervals. That is a real cerebrovascular result in a population and at a dose very unlike this purchase.
Who publishes this Memodyne website?
- Mariotti F, Petzke KJ, Bonnet D, et al. Kinetics of the utilization of dietary arginine for nitric oxide and urea synthesis: insight into the arginine-nitric oxide metabolic system in humans. Am J Clin Nutr. 2013;97(5):972-9. PMID 23535108. https://pubmed.ncbi.nlm.nih.gov/23535108/
- Khalaf D, Krüger M, Wehland M, Infanger M, Grimm D. The Effects of Oral l-Arginine and l-Citrulline Supplementation on Blood Pressure. Nutrients. 2019;11(7):1679. PMID 31336573. https://pubmed.ncbi.nlm.nih.gov/31336573/
- Morita M, Hayashi T, Ochiai M, et al. Oral supplementation with a combination of L-citrulline and L-arginine rapidly increases plasma L-arginine concentration and enhances NO bioavailability. Biochem Biophys Res Commun. 2014;454(1):53-7. PMID 25445598. https://pubmed.ncbi.nlm.nih.gov/25445598/
- Rougé C, Des Robert C, Robins A, et al. Manipulation of citrulline availability in humans. Am J Physiol Gastrointest Liver Physiol. 2007;293(5):G1061-7. PMID 17901164. https://pubmed.ncbi.nlm.nih.gov/17901164/
- Song S, Thapa SK, Upadhyay M, et al. Quantitative characterization of L-citrulline as a precursor of L-arginine in rats: pharmacokinetic basis for nitric oxide-mediated effects. Front Pharmacol. 2026;17:1889835. PMID 42755674. https://pubmed.ncbi.nlm.nih.gov/42755674/
- Li A, Li H, Chen J. The effects of L-citrulline supplementation on cerebrovascular function during sprint interval training in taekwondo athletes. J Exerc Sci Fit. 2025;23(3):222-228. PMID 40474881. https://pubmed.ncbi.nlm.nih.gov/40474881/
- Luo P, Chen J, Liu K, Zhang J. Does l-citrulline supplementation and watermelon intake reduce blood pressure in middle-aged and older adults? A systematic review and meta-analysis of randomized controlled trials. Clin Nutr ESPEN. 2025;69:653-664. PMID 40789388. https://pubmed.ncbi.nlm.nih.gov/40789388/
- Figueroa A, Jaime SJ, Morita M, Gonzales JU, Moinard C. L-Citrulline Supports Vascular and Muscular Benefits of Exercise Training in Older Adults. Exerc Sport Sci Rev. 2020;48(3):133-139. PMID 32568925. https://pubmed.ncbi.nlm.nih.gov/32568925/
- Morris MC, Evans DA, Bienias JL, et al. Dietary niacin and the risk of incident Alzheimer's disease and of cognitive decline. J Neurol Neurosurg Psychiatry. 2004;75(8):1093-9. PMID 15258207. https://pubmed.ncbi.nlm.nih.gov/15258207/
- Chen Q, Huang J, Shi X, et al. Associations between dietary B vitamin intakes and cognitive function among elderly individuals: An observational study. Nutrition. 2025;134:112716. PMID 40056822. https://pubmed.ncbi.nlm.nih.gov/40056822/
- Ghasemifard N, Lewis JR, Radavelli-Bagatini S, et al. Calcium supplementation and the risk of dementia in the Perth Longitudinal Study of Aging Women: a post-hoc analysis of a randomised clinical trial for fracture prevention. Lancet Reg Health West Pac. 2025;63:101694. PMID 41346785. https://pubmed.ncbi.nlm.nih.gov/41346785/
- Lin FR, Pike JR, Albert MS, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. Lancet. 2023;402(10404):786-797. PMID 37478886. https://pubmed.ncbi.nlm.nih.gov/37478886/
- SPRINT MIND Investigators for the SPRINT Research Group; Williamson JD, Pajewski NM, Auchus AP, et al. Effect of Intensive vs Standard Blood Pressure Control on Probable Dementia: A Randomized Clinical Trial. JAMA. 2019;321(6):553-561. PMID 30688979. https://pubmed.ncbi.nlm.nih.gov/30688979/
- Yeung LK, Alschuler DM, Wall M, et al. Multivitamin Supplementation Improves Memory in Older Adults: A Randomized Clinical Trial. Am J Clin Nutr. 2023;118(1):273-282. PMID 37244291. https://pubmed.ncbi.nlm.nih.gov/37244291/
- Baker LD, Manson JE, Rapp SR, et al. Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial. Alzheimers Dement. 2023;19(4):1308-1319. PMID 36102337. https://pubmed.ncbi.nlm.nih.gov/36102337/
- Yasser E, Ayache L, El Khayat H, et al. Sleep and memory consolidation: Neural and cognitive perspectives. Prog Brain Res. 2026;299:137-176. PMID 42547206. https://pubmed.ncbi.nlm.nih.gov/42547206/
Order Memodyne knowing what the mechanism can and cannot claim
A real chain of chemistry, a sensible ingredient choice for the first half of it, and no published trial of the finished capsule. That is the whole picture, and it is the picture to buy on.
Two bottles $158 · six bottles $294 · 60 days from purchase
Order Memodyne From This ShopLot MEM-26/ME-6233 · 30 capsules, one each morning · dispatched from within the United States
