L-Arginine
Full L-Arginine pageAn amino acid the body converts into nitric oxide, the signalling molecule involved in relaxing blood vessel walls and supporting circulation.
Six ingredients across three pathways, every one named. Here is what each is, what it contributes, and the one thing the label does not tell you.
Memodyne takes an approach that is unusual in this category and worth understanding before the individual ingredients.
Rather than combining six unrelated compounds, the formula uses four different sources feeding a single pathway — two forms of arginine and two of citrulline, all relating to nitric oxide production — then adds one essential vitamin for cellular energy and one amino acid for antioxidant support.
The intent behind four sources appears to be absorption and duration. Oral arginine is substantially broken down in the gut and liver before reaching circulation, which is why citrulline is often preferred: it bypasses that first-pass metabolism and converts to arginine in the kidneys. Pairing each with a Krebs cycle intermediate — alpha-ketoglutarate and malate — connects the circulation pathway to cellular energy production.
Whether that combination outperforms a single well-dosed ingredient is a legitimate question. It is also unanswerable from outside, for the reason set out below.
All six ingredients are named, which is more than many products in this category offer. What is not published is how much of each one a capsule contains.
That matters, because an ingredient's effect depends on its amount, and without figures nothing here can be compared to the doses used in published research. No milligram figures appear anywhere on this website — inventing them would be worse than leaving them out. If you see a page quoting precise amounts for this product, that information is not coming from the manufacturer.
Each ingredient, what it contributes, and a link to the page covering it in depth.
An amino acid the body converts into nitric oxide, the signalling molecule involved in relaxing blood vessel walls and supporting circulation.
Arginine paired with alpha-ketoglutarate, a compound from the cellular energy cycle, included to support absorption and extend the effect.
An amino acid the kidneys convert into arginine, which in practice raises arginine levels more reliably than taking arginine itself.
Citrulline combined with malate, an intermediate in the Krebs cycle, linking the circulation pathway to cellular energy production.
An essential vitamin and the precursor for NAD+, the coenzyme central to how cells convert food into usable energy.
An amino acid the body combines with histidine to form carnosine, a compound studied for its buffering and antioxidant roles.
Where the evidence is stronger, where it is thinner, and what none of it establishes.
The circulation ingredients. Nitric oxide biology is established physiology, recognised with a Nobel Prize in 1998. Arginine and citrulline are genuine precursors, and citrulline supplementation reliably raises plasma arginine. Most human research, however, has examined exercise performance, blood pressure and systemic vascular function rather than cerebral blood flow specifically.
Niacin. The best-supported ingredient here. Vitamin B3 is essential, is the precursor for NAD+, and carries a formally recognised role in normal energy-yielding metabolism. That describes what adequate intake does rather than what surplus adds.
Beta-alanine. Well studied, but predominantly in exercise science. Beta-alanine reliably raises muscle carnosine, and carnosine has documented buffering and antioxidant properties. The extension to brain tissue is plausible rather than demonstrated.
The research described here examined individual ingredients, usually on their own, at doses set by the researchers. It provides scientific context for why an ingredient is included in a formula.
It does not demonstrate that the finished Memodyne product produces the same outcomes. No clinical trial of this finished formula has been published, so nothing on this website is product-level clinical evidence.
Worth connecting explicitly, since ingredient lists and benefit lists often sit apart with no stated relationship.
The brain circulation positioning rests on the four nitric oxide precursors. The cellular energy positioning rests on niacin, and is the best-evidenced claim in the formula. The antioxidant positioning rests on beta-alanine and carnosine. The mental clarity framing is an inference drawn across all three rather than a separate mechanism.
None of these ingredients produces cognitive improvement independently of sleep, exercise, hydration and cardiovascular health — and in this formula's case, aerobic exercise in particular does more for circulation than any capsule can.
This formula is built around nitric oxide precursor amino acids, which relate to blood vessel dilation. That makes a medication check genuinely important rather than a formality. Show the label to your doctor before your first capsule if you:
Memodyne is a dietary supplement for healthy adults. It is not a substitute for prescribed medication or for treatment of any diagnosed neurological or cardiovascular condition.
The same six-ingredient formula in every package. What changes is the supply length, the per-bottle rate, the shipping and whether the five bonus guides are included.
$158 total ·
brand's compare-at price $358
$294 total ·
brand's compare-at price $1,074
$207 total ·
brand's compare-at price $537
Compare-at figures are the brand's own stated reference prices rather than an independent valuation. Promotional pricing is set at the official checkout and can change — confirm the current offer, shipping cost and total there before completing a purchase.
Memodyne is backed by a 60-day money-back guarantee running from the date of purchase. The brand states that after at least 30 days of use, if you are not completely satisfied, you contact customer support before the 60-day window closes to discuss your options.
Purchase date. Note it down — the window runs from here, not from delivery.
The brand's suggested trial period. Circulation support is framed as gradual.
Guarantee closes. Contact support before this date, not after.
Two practical points. The window starts at purchase rather than delivery, so shipping time comes out of your 60 days. And the six-bottle package holds 180 days of product, so the guarantee closes with four bottles still unopened — set a reminder for around day 50.
Full refund terms are set by the seller. Read the official policy at checkout before ordering.
One capsule each morning with a full glass of water, taken alongside the balanced nutrition, hydration and regular activity that support circulation far more than any capsule does on its own. Six named ingredients, no artificial stimulants, and a 60-day money-back guarantee on every order.
From $49 per bottle · Non-stimulant · Free US shipping on 3 and 6 bottles · 5 bonus guides included