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Melonex Side Effects: Reports on Arginine and Citrulline
No source we found tests Melonex side effects, because no trial of the capsule exists. Sources on its ingredients report nausea, bloating, diarrhea and headache, mostly at gram doses. The label says to ask a physician first if you have a medical condition, are pregnant or nursing, or are under 18.
Written by the Melonex label deskUpdated · 4 min read
Are there known Melonex side effects?
No one has published a side effect study of Melonex, so its own effects are unknown.
What exists is information about the three names inside it. Those sources describe gram-scale doses. The blend is 500 mg a capsule, and the amount of each name is not printed, so the reports may not carry over. They are still the best guide to what to watch for.
The FDA does not approve supplements before sale (FDA, Q&A on Dietary Supplements). Makers carry the first duty for safety, which is why your own care matters more than any claim on a bottle.
What side effects do arginine and citrulline sources list?
Sources list stomach upset first: nausea, bloating, cramping and diarrhea.
Mayo Clinic adds abdominal pain, gout, headache, allergic reactions and worse asthma for L-arginine (Mayo Clinic, L-arginine). Cleveland Clinic adds dizziness (Cleveland Clinic, L-arginine). For citrulline, Cleveland Clinic lists bloating, cramping, diarrhea and sweating, and says larger trials are needed to set doses and find side effects (Cleveland Clinic, L-citrulline).
| Ingredient | Reported effects | Source |
|---|---|---|
| L-arginine | Nausea, abdominal pain, diarrhea, bloating, gout, headache, allergy, worse asthma | Mayo Clinic |
| L-arginine | Bloating, diarrhea, dizziness, nausea | Cleveland Clinic |
| L-citrulline | Bloating, cramping, diarrhea, sweating | Cleveland Clinic |
| Alpha-ketoglutarate | Little human data; long-term safety an open question | 2026 review |
The last row comes from a review that found a lack of human evidence for alpha-ketoglutarate (Devulapalli 2026, AKG review). It is a gap, not a clean bill of health.
Who should not take Melonex without asking first?
Anyone with a medical condition, anyone pregnant or nursing, and anyone under 18 should ask a physician first. The label says so.
Arginine sources add specific cautions. Mayo Clinic, Memorial Sloan Kettering and Cleveland Clinic all advise against arginine after a recent heart attack (Mayo Clinic, L-arginine) (MSK, Arginine) (Cleveland Clinic, L-arginine). Mayo also lists blood pressure medicines, nitrates, sildenafil-type medicines, potassium-sparing diuretics, blood thinners and diabetes medicines as possible interactions.
Keep taking prescribed medicine. Never stop or change it because of a supplement.
- Chest discomfortPressure, squeezing, fullness or pain in the center of the chest, lasting more than a few minutes or coming and going.
- Discomfort elsewhereArms, back, neck, jaw or stomach.
- Other signsShortness of breath, cold sweat, nausea or lightheadedness.
- Stroke: B.E. F.A.S.T.Balance, Eyes, Face, Arms, Speech, Time: any sign means call 911 and note when it started.
- Call 911, do not driveAny of these: call 911 right away. Do not drive yourself or the person to the hospital.
Signs from AHA (AHA, Warning Signs of a Heart Attack) and CDC (CDC, Signs and Symptoms of Stroke). This list is not complete, and a supplement is never a reason to wait.
Stop the capsules and call 911 for chest pain, trouble breathing, fainting, or face, arm or speech changes.
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsWhat should you do if you feel a reaction?
Stop taking the capsules and call your doctor or pharmacist. Keep the bottle and note the lot number.
You can also report the problem to the FDA through MedWatch (FDA, MedWatch). For order matters, the order desk is +1 (855) 889-3137. Our website inbox cannot see orders.
Read the side effects page for more detail. If you decide the capsules suit you after talking to your doctor, here are the packs from the sales page.
180-day supply
3 bottles: 180 days
$207$69 a bottle · about $1.15 a day
Free US shipping · 60-day money back
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Lowest per bottle
6 bottles: 360 days
$294$49 a bottle · about $0.82 a day
Free US shipping · 60-day money back
Order 6 bottlesPrices on the Melonex sales page, October 19, 2026 (Melonex sales page). Two bottles are also sold for $158, plus $9.99 shipping. Check your medicines with your doctor or pharmacist before you order.
FAQ01
Melonex questions people ask
Can Melonex cause an upset stomach?
It might. Sources on arginine and citrulline list nausea, bloating, cramping and diarrhea, mostly at gram doses. Melonex has no trial, and its blend is 500 mg, so we cannot say how often it happens. Stop and call a doctor if it persists.
Is Melonex safe with blood pressure medicine?
Ask first. Mayo Clinic, Memorial Sloan Kettering and Cleveland Clinic all list blood pressure medicines as a possible interaction with arginine. Keep taking your prescription as directed and have your pharmacist check the label before you start.
Is Melonex safe after a heart attack?
Three sources, Mayo Clinic, Memorial Sloan Kettering and Cleveland Clinic, advise against arginine after a recent heart attack. Melonex contains two arginine forms, so ask your cardiologist before any use.
Who wrote this02
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is the information site for the Official U.S. Melonex shop. It is not the manufacturer or the distributor named on the label. We make money when you buy through our order links.
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