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What Does Melon Extract Do? Watermelon, Citrulline and Melonex
What does melon extract do? Watermelon contains citrulline, an amino acid the kidneys convert into arginine, and that link is the reason melon extracts are sold. The Melonex label, however, lists no melon extract. It lists L-citrulline DL-malate, so the name suggests a melon that the ingredient panel never states.
Written by the Melonex label deskUpdated · 4 min read
What does melon extract do in the body?
Melon extract, usually watermelon extract, is sold for its citrulline. The amino acid is named after Citrullus lanatus, the watermelon, which holds about 0.7 to 3.6 g per kg of fresh fruit in both flesh and rind (Aguayo 2021, L-citrulline review).
In the kidneys, about 83% of citrulline becomes arginine, so more arginine reaches the blood than when arginine itself is swallowed (Aguayo 2021, L-citrulline review). Arginine then feeds the body's nitric oxide system.
How much watermelon equals a trial dose?
A trial dose of 3 g of citrulline equals roughly 0.8 to 4.3 kg of fresh watermelon, depending on the cultivar. That is simple division of the figures above.
| Source | Citrulline |
|---|---|
| 1 kg fresh watermelon (Aguayo 2021, L-citrulline review) | About 0.7 to 3.6 g |
| Trial range for blood pressure (Barkhidarian 2019, citrulline meta-analysis) | 3 to 9 g a day |
| One Melonex capsule | Line 1 of 3, between about 167 and 500 mg of citrulline malate |
The capsule weight includes the malate, so the citrulline itself is less.
Is there melon extract in Melonex?
No melon extract appears on the Melonex label. The blend lists L-citrulline DL-malate, L-arginine alpha-ketoglutarate and L-arginine HCl, and no source for the citrulline.
The front says "Natural Formula*", a phrase the label never defines. Read the supplement facts for the full list.
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsWhat have citrulline trials found?
Eight trials of L-citrulline at 3 to 9 g a day found systolic pressure about 4.1 mm Hg lower, while the diastolic drop was not significant (Barkhidarian 2019, citrulline meta-analysis). Those were purified citrulline doses, not melon extracts.
Citrulline may add to blood pressure drugs, nitrates and sildenafil. Ask your pharmacist first, and read the L-citrulline malate page.
Want the capsules instead of the melon?
The two larger Melonex packs are below.
Free US shipping3 bottles · $207$69 a bottle · 180 days at 1 capsule a day · free US shippingChoose 3 bottles
Lowest per bottle6 bottles · $294$49 a bottle · 360 days at 1 capsule a day · free US shippingChoose 6 bottlesSales-page prices, October 18, 2026 (Melonex sales page). A 2-bottle pack is also sold ($158 plus $9.99 shipping). See every pack on the pricing page.
FDA disclaimer. These statements have not been evaluated by the Food and Drug Administration. Melonex is not intended to diagnose, treat, cure, or prevent any disease. Keep taking prescribed medicine, and ask your doctor before starting any supplement.
FAQ01
Melonex questions people ask
Is Melonex made from watermelon?
The label does not say. It lists L-citrulline DL-malate and two arginine salts, with no melon, fruit or extract named. Ask the order desk at +1 (855) 889-3137 if the citrulline source matters to you.
Does watermelon rind have more citrulline?
One review reports citrulline in both the flesh and the rind, at about 0.7 to 3.6 g per kg of fresh fruit depending on the cultivar. It gives no ranking of flesh versus rind.
Can melon extract replace blood pressure medicine?
No. Citrulline trials found small drops in readings, and none tested melon extract as a replacement for medicine. Keep taking what your doctor prescribed and talk to them before adding any supplement.
Who wrote this02
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Pages built from the label, the sales page and linked NIH, FDA, AHA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a USA authorized Melonex retailer, not by the manufacturer or the distributor. We earn money when you buy through our order links.
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