Answer: Melonex ingredients are three amino acid compounds: L-citrulline DL-malate, L-arginine alpha-ketoglutarate (arginine AKG, as a dihydrate) and L-arginine hydrochloride (arginine HCl). The body uses arginine to make nitric oxide, which helps blood vessels relax, and converts citrulline into arginine. The brand does not publish milligram amounts online, so the Supplement Facts panel on the bottle is the authority on how much each serving contains.
- Three compounds: citrulline DL-malate, arginine AKG and arginine HCl.
- All relate to arginine, which the body uses to make nitric oxide.
- Milligram amounts are on the bottle, not published online.
- Research on these ingredients is small and mixed.
Melonex ingredients at a glance
Melonex keeps its formula short. It contains three amino acid compounds, each linked to arginine and the nitric oxide pathway. L-citrulline DL-malate is citrulline bound to malate. L-arginine alpha-ketoglutarate, often called arginine AKG, is arginine bound to alpha-ketoglutarate and listed as a dihydrate. L-arginine hydrochloride, or arginine HCl, is arginine in a salt form.
The brand names these ingredients but does not publish milligram amounts online. That means the Supplement Facts panel on the bottle is the only reliable source for how much of each you get per serving. We cover the full list on our Melonex ingredients page and explain the mechanism on how Melonex works.
L-citrulline DL-malate
Citrulline is an amino acid found naturally in watermelon. Your body does not use it to build proteins; instead, the kidneys convert it to arginine. Because of that route, citrulline can raise blood arginine levels, which is one reason formulas include it alongside arginine itself.
The malate part is malic acid, a compound found in fruit and involved in how cells produce energy. The "DL" refers to the two mirror-image forms of malate. Research on citrulline malate is mostly in exercise settings, and you can browse it through PubMed studies on citrulline malate. Findings are mixed. Our dedicated explainer on citrulline malate goes further, and L-citrulline vs L-arginine explains why formulas use both.
Arginine AKG and arginine HCl
Arginine is the amino acid the body uses directly to make nitric oxide in the lining of blood vessels. Nitric oxide signals the surrounding muscle to relax, supporting blood flow. Melonex provides arginine in two forms.
- Arginine AKG pairs arginine with alpha-ketoglutarate, a compound involved in cell energy metabolism. Studies on it are limited; see PubMed studies on arginine alpha-ketoglutarate.
- Arginine HCl is a common, stable salt form of arginine.
Using two forms is a formulation choice. We have not seen evidence that the combination works better than either alone, and we would not claim it does. Our arginine AKG explainer covers that compound in more detail.
| Ingredient | What it is | Role in the body |
|---|---|---|
| L-citrulline DL-malate | Citrulline bound to malic acid | Converted to arginine in the kidneys |
| Arginine AKG (dihydrate) | Arginine bound to alpha-ketoglutarate | Arginine used to make nitric oxide |
| Arginine HCl | Arginine as a hydrochloride salt | Arginine used to make nitric oxide |
| Milligram amounts | Not published online | See the Supplement Facts panel |
Worked example: reading the label in two minutes
When a bottle arrives, here is the order we would read the label in. First, find the serving size: how many capsules make one serving. Second, read the list of ingredients and amounts in the Supplement Facts box; this is where milligrams appear. Third, check the "other ingredients" line beneath it for the capsule shell and any fillers, which matters if you avoid certain materials. Fourth, read the directions and warnings. Fifth, note the lot number and expiration date.
Take a photo of the panel and bring it to your doctor or pharmacist if you take any medicine. That photo is far more useful than a website summary, ours included. For a fuller walkthrough, see our guide on reading a Supplement Facts panel.
What the research shows, and where the formula fits
Trials of arginine and citrulline supplements on blood pressure and blood flow are small and mixed. Where effects appear, they are modest, and not every study finds one. Collections of this research are available through PubMed research on L-arginine and blood pressure. None of it shows that these ingredients treat or prevent heart disease or high blood pressure.
So the honest place for Melonex is behind the basics: eating well, moving daily, sleeping enough and following your doctor's plan. It is designed to support nitric oxide production and healthy circulation as one extra layer. Arginine can add to the effects of blood pressure medicine, nitrates and erectile dysfunction drugs, so ask your doctor first if you take any of them. Our Melonex benefits page keeps claims within those limits.
Quality and sourcing
According to the brand, Melonex is made in the USA in a GMP facility. GMP, or good manufacturing practice, refers to manufacturing standards for consistency and cleanliness; it is not a test of whether a product works. No supplement is FDA approved, and Melonex is no exception.
The best way to know your bottle matches the label described here is to buy from the Melonex official website. Third-party listings may sell older or altered stock. Each bottle holds 60 capsules, and you can see the package options, which are the only Melonex discount available, on the pricing page. Whichever package you choose, keep the bottle with its label intact so you and your doctor can always check exactly what you are taking.
See the formula for yourself
Read the full label details and package prices on the Melonex official website.
Visit the Melonex Official WebsiteFrequently asked questions
What are the Melonex ingredients?
L-citrulline DL-malate, L-arginine alpha-ketoglutarate (as a dihydrate) and L-arginine hydrochloride. All are amino acid compounds.
How many milligrams of each ingredient are in Melonex?
The brand does not publish amounts online. Check the Supplement Facts panel on your bottle, which is the authority.
Why does Melonex contain both citrulline and arginine?
Arginine is used directly to make nitric oxide, and citrulline is converted to arginine in the kidneys. Formulas often pair them, though research on the combination is limited.