How Memodyne Is Meant to Work, Link by Link
Quick answer
The brand says Memodyne works by raising nitric oxide, which widens blood vessels and sends more blood to the brain.
One capsule has under 400 mg of arginine and under 200 mg of citrulline. Blood pressure studies used 3 to 24 g a day.
How does Memodyne claim to work? The nitric oxide story in plain words
The brand says Memodyne works through blood flow. Its sales page says the formula "increases cerebral blood flow through nitric oxide precursors like L-Arginine and L-Citrulline", and that each ingredient was picked to raise blood flow in the brain.
Put simply, the story has four steps. You swallow amino acids. Your body turns some of them into nitric oxide. Nitric oxide relaxes blood vessels so they widen. Wider vessels in the head, the brand implies, mean a brain that focuses better and stays clear.
The first three steps are real biology. The fourth, and the idea that a few hundred milligrams moves any of them, is where the evidence runs out. The rest of this page checks each step.
Does arginine raise nitric oxide? Each link of the chain, checked
Partly, at gram doses, in the blood vessels of the body. Here is how each step holds up against the health sources we opened.
- Link 1
Capsule to arginine
About 80% of the body's citrulline is turned into arginine in the kidneys, so both forms feed one pool (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional)). This part is solid.
- Link 2
Arginine to nitric oxide
"Some" arginine becomes nitric oxide, a strong blood vessel relaxer. Citrulline "might" raise nitric oxide markers in the blood (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional)). Note the careful wording.
- Link 3
Nitric oxide to wider vessels
Arginine is a vasodilator and can lower blood pressure a little (Mayo Clinic, L-arginine). That effect was measured with grams, not milligrams.
- Link 4
Wider vessels to a sharper brain
No source we opened shows arginine or citrulline raising blood flow in the brain or improving focus or memory, at any dose.
So the chain breaks at the last step, the only one a buyer cares about. Our nitric oxide explainer covers the molecule itself in more depth.
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Best price: $49/bottle when you take 6 ($294). Free shipping on 3+ · 60-day money-back window · Checkout by BuyGoods.
What have arginine and citrulline studies actually measured?
Blood pressure, exercise and erectile function, almost always with several grams a day. None of the outcomes is attention, clarity or memory.
| Outcome studied | Daily dose used | What was found |
|---|---|---|
| Blood pressure (arginine) | 4 to 24 g | Can lower blood pressure; gains are small (RxList, L-Arginine (supplement monograph)) (WebMD, L-Arginine) |
| Blood pressure (citrulline) | 3 to 9 g | Top number about 4 mm Hg lower across 8 small trials (Avicenna J Phytomed 2019, Barkhidarian et al., L-citrulline and blood pressure meta-analysis) |
| Exercise (arginine) | 2 to 20 g | Little to no effect on performance (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional)) |
| Exercise (citrulline) | 3 to 9 g, or 8 g of the malate form | Research does not strongly support it (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional)) |
| After a heart attack (arginine) | About 9 g | No benefit, and more deaths than placebo (JAMA 2006, Schulman et al., L-arginine after heart attack (VINTAGE MI)) |
| Memodyne, one capsule | Under 400 mg arginine, under 200 mg citrulline | Never tested |
One drug-information site lists age-related memory loss for arginine but rates the evidence "Insufficient Evidence to Rate" (RxList, L-Arginine (supplement monograph)). The two amino acids are compared in citrulline vs arginine.
Is there evidence that nitric oxide supplements help memory or focus?
No. We found no study linking these ingredients, at any amount, to better memory, focus or thinking in healthy adults. The wider picture says the same about brain supplements in general.
- An AARP-convened expert panel found no evidence that any supplement prevents, slows or reverses cognitive decline (Global Council on Brain Health (AARP), The Real Deal on Brain Health Supplements).
- The Alzheimer's Association says no supplement has been proven to prevent, treat or cure Alzheimer's (Alzheimer's Association, Alternative Treatments).
- The NIH says direct evidence that supplements prevent dementia is lacking (NCCIH, 7 Things To Know About Supplements and Alzheimer's).
None of these three reviews even mentions arginine, citrulline, beta alanine or niacin. They were not tested and found wanting; they were simply never shown to work for the brain. What the label words can fairly mean is on the benefits page.
The brand's ingredient claims next to what the sources say
The sales page gives each ingredient a one-line job. Here is each line, where it appears, and what we could confirm.
- Marketing only
Converts directly into nitric oxide, dilating blood vessels in the brain
Sales page, L-arginineSome arginine becomes nitric oxide. Nothing we opened mentions vessels in the brain.
- Marketing only
Improves absorption and extends the vasodilating effect
Sales page, arginine AKGNo authoritative page on the AKG form was found, so this cannot be checked.
- Marketing only
A continuous cycle of nitric oxide production
Sales page, L-citrulline HClCitrulline is turned into arginine. "Continuous" is the brand's word, not a finding.
- Marketing only
Improves cerebral microcirculation
Sales page, niacinThe NIH niacin sheet discusses memory only as a sign of severe deficiency.
- Marketing only
Raises carnosine in the brain and protects neurons
Sales page, beta alanineBeta alanine raises muscle carnosine at 4 to 6 g a day (ISSN position stand: Beta-Alanine (2015)). The label has 40 mg.
- On the label
Cognitive support formula
Bottle frontThe only function claim on the label, with the FDA disclaimer.
How big is the gap between the label and the studied doses?
Each bar shows how much of the smallest studied dose one capsule supplies. Short bars mean a gap of ten times or more, before any question of whether the effect would reach the brain.
Label: under 400 mg. Studied: 4 to 24 g a day in blood pressure studies. (RxList, L-Arginine (supplement monograph)) (Memorial Sloan Kettering, Arginine (About Herbs))
Label: under 200 mg. Studied: 3 to 9 g a day in blood pressure trials. (Avicenna J Phytomed 2019, Barkhidarian et al., L-citrulline and blood pressure meta-analysis) (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional))
Label: 40 mg. Studied: 4 to 6 g a day in exercise studies. (ISSN position stand: Beta-Alanine (2015)) (NIH ODS, Dietary Supplements for Exercise and Athletic Performance (health professional))
Label: 7.5 mg NE. Studied: 14 to 16 mg NE a day adult need (RDA). (NIH ODS, Niacin (health professional))
Label: 18 mg. Studied: 1,000 to 1,200 mg a day adult need. (NIH ODS, Calcium (health professional))
What raises blood flow to the brain, according to health sources?
Moving your body. Mayo Clinic's memory advice says physical activity raises blood flow to the whole body, brain included, and lists sleep, social contact and managing health conditions beside it (Mayo Clinic, Memory loss: 7 tips to improve your memory). No supplement makes that list.
Keeping blood pressure in range is on it too, through those health conditions. That is ordinary medical care, not a capsule.
One more mix-up to clear: nitric oxide is a gas the body makes in tiny amounts. It is not nitrous oxide, the dentist's laughing gas, and it is not the nitrate pills used for chest pain.
Questions about the science behind Memodyne
What is the Memodyne mechanism of action?
The brand says arginine and citrulline raise nitric oxide, widen blood vessels and increase blood flow to the brain. Only the vessel part has support, at gram doses, and nothing links it to focus or memory.
Does Memodyne increase blood flow to the brain?
No source we opened shows that. Arginine can widen blood vessels and lower blood pressure slightly at several grams a day, measured in the body, not the brain.
Is a nitric oxide booster the same as brain support?
No. Nitric oxide is a normal signalling molecule in the body, but that does not mean a booster improves thinking, and no study we found shows that it does.
Why does Memodyne use both arginine and citrulline?
Citrulline is mostly turned into arginine in the kidneys, so both feed the same pathway. The label has under 400 mg of arginine and under 200 mg of citrulline in total.
Does Memodyne work like a pre-workout?
The ingredients are the same family used in pre-workout powders, but at a small share of those doses, and without caffeine.
Can a nitric oxide supplement lower blood pressure?
Arginine and citrulline can lower it a little at gram doses. That is why people on blood pressure medicine, nitrates or sildenafil should ask a doctor first.
Has anyone tested how Memodyne works in people?
No. We found no study of the finished formula, and the brand's "Scientific References" section shows logos without any studies.
Page check
Written by
Compares each label amount with the doses used in published research, using NIH, FDA and Alzheimer's Association pages.
Reviewed by
Dr. Harald Hampel, MD, PhD, MD, Physician
Medical reviewer. Review date: October 13, 2026.
- Last compared with the label: October 13, 2026
- Facts come from the Supplement Facts panel and the brand pages; health lines come from the sources linked above
- Corrections go to [email protected]; our checking rules are on the standards page