Safety
Melonex Side Effects and Safety: What Arginine and Citrulline Can Do
Melonex side effects have not been studied, because no trial tested the capsules. Sources on its amino acids list nausea, bloating, diarrhea and dizziness. Mayo Clinic, MSK and Cleveland Clinic advise against arginine after a recent heart attack. Arginine may also add to blood pressure medicines, so ask first.
Written by the Melonex label deskUpdated
Reported effects01
What are the side effects of Melonex?
No study has measured side effects of Melonex itself, so the list comes from sources on arginine and citrulline.
The most often named problems are stomach complaints: nausea, cramping, bloating and diarrhea. Dizziness and headache also appear. Gout and allergic reactions are listed for arginine by Mayo Clinic (Mayo Clinic, L-arginine).
Those pages describe the amino acids on their own, often at gram doses. The Melonex blend is 500 mg per capsule, with the amounts of each name unprinted. Treat the table as a watch list, not a forecast.
| Ingredient on the label | Source | Effects named |
|---|---|---|
| L-Arginine HCl and arginine AKG | Mayo Clinic | Nausea, abdominal pain, diarrhea, bloating, gout, headache, allergic reactions, worse asthma |
| L-Arginine | Cleveland Clinic | Bloating, diarrhea, dizziness, and others |
| L-Citrulline DL-Malate | Cleveland Clinic | Bloating, cramping, diarrhea, sweating |
| Alpha-ketoglutarate | No safety page found | Not established |
The sources are (Mayo Clinic, L-arginine), (Cleveland Clinic, L-arginine) and (Cleveland Clinic, L-citrulline).
Safety02
Is Melonex safe to take?
For many healthy adults the amino acids on the label are described as generally safe by mouth, but "generally safe" is not a guarantee for you.
Mayo Clinic calls L-arginine generally safe by mouth for most people (Mayo Clinic, L-arginine). Melonex itself has no safety trial. The FDA does not approve supplements before sale, and the maker carries the first duty for safety (FDA, Q&A on Dietary Supplements).
Two facts limit what anyone can say. The amounts of each name are hidden, and no allergen statement is printed. That does not mean the capsule is allergen-free. The label is silent.
Medicines03
Does Melonex interact with medicines?
Possibly. Arginine may add to blood pressure medicines, and some sources name more drug types. Each source names different ones, so the table shows who said what.
The idea behind these products is to relax blood vessels. A medicine that does the same can stack with it, so pressure may drop too low.
| Medicine type | Mayo Clinic | MSK | Cleveland Clinic |
|---|---|---|---|
| Blood pressure medicines | Yes | Yes | Yes |
| Nitrates | Yes | Not named | Yes |
| Sildenafil-type medicines | Yes | Not named | Not named |
| Potassium-sparing diuretics | Yes | Not named | Not named |
| Blood thinners and antiplatelets | Yes | Not named | Not named |
| Diabetes medicines | Yes | Not named | Not named |
See (Mayo Clinic, L-arginine), (MSK, Arginine) and (Cleveland Clinic, L-arginine). Cleveland Clinic lists no citrulline interactions, and we claim none. A blank cell means not named, not safe. The medicines guide goes deeper.
Never cut back or stop a prescribed medicine because of a supplement (AHA, Managing BP Medications). Tell your pharmacist about every supplement you take (NIH ODS, Supplements: What You Need to Know).
The strongest caution04
Should you avoid Melonex after a heart attack?
Yes, ask your cardiologist before any arginine product. Mayo Clinic, MSK and Cleveland Clinic all advise against arginine after a recent heart attack (Mayo Clinic, L-arginine) (MSK, Arginine) (Cleveland Clinic, L-arginine).
The main evidence is the VINTAGE MI trial. It gave L-arginine, about 9 g a day, or placebo to 153 patients after a first heart attack. Six of 70 people on arginine died, against none on placebo. The safety committee closed enrollment (JAMA 2006, VINTAGE MI trial).
That dose is far above the 500 mg Melonex blend. We are not saying Melonex caused harm to anyone. We are reporting what the sources say, and they say avoid. The label's "known medical condition" line covers heart disease too.
The sources do not define "recent". Your cardiologist should decide.
Quick check05
Is Melonex a fit for you?
Answer five quick questions. Any "yes" means call your doctor or pharmacist first.
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsEmergency signs06
When should you call 911 instead of reading about side effects?
Call 911 for chest pain or pressure, trouble breathing, fainting, or sudden face, arm or speech changes. Do not wait to see if a capsule is the cause.
Heart attack signs can include chest discomfort, shortness of breath, a cold sweat and lightheadedness (AHA, Warning Signs of a Heart Attack). Stroke signs follow the F.A.S.T. pattern, and a call to 911 is the right move, not a drive to the hospital (CDC, Signs and Symptoms of Stroke).
- 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.
Watch for07
What if you feel dizzy or sick after taking Melonex?
Sit down, drink water and stop taking the capsule until you speak to a doctor or pharmacist.
Dizziness is on the Cleveland Clinic list for arginine (Cleveland Clinic, L-arginine), and Mayo notes that pressure may drop too low with some medicines (Mayo Clinic, L-arginine). If you own a cuff, a reading during the spell helps your doctor. The home monitoring guide shows how to take one.
- Hives, swelling or wheezing: treat as an allergic reaction and get urgent care.
- Lasting dizziness or fainting: stop and call your doctor.
You can also report a problem to the FDA through MedWatch (FDA, MedWatch), and tell the order desk at +1 (855) 889-3137 if you want a refund under the guarantee.
On the bottle08
What cautions does the Melonex label print?
The label prints a short caution: do not exceed the recommended dose, consult a physician if pregnant, nursing, under 18 or living with a medical condition, and keep out of reach of children.
It also says not to use the product if the safety seal is damaged or missing. The full wording: "Do not exceed recommended dose. Pregnant or nursing mothers, children under the age of 18 and individuals with a known medical condition should consult a physician before using this or any dietary supplement. Keep out of the reach of children. Do not use if safety seal is damaged or missing."
Missing from the label: any list of drug interactions, any heart attack warning and any allergen statement. The sources above fill that gap.
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsFAQ09
Melonex side effects and safety questions
Can Melonex cause stomach upset or diarrhea?
It might. Mayo Clinic lists nausea, abdominal pain, diarrhea and bloating for arginine, and Cleveland Clinic lists bloating, cramping and diarrhea for citrulline (Mayo Clinic, L-arginine) (Cleveland Clinic, L-citrulline). No trial tested Melonex, so tell your pharmacist if symptoms last.
Can Melonex cause low blood pressure?
The sources name this risk with other medicines. Mayo says arginine taken with blood pressure medicines, nitrates or sildenafil may drop pressure too low (Mayo Clinic, L-arginine). No study measured it for Melonex, so ask a pharmacist before combining them.
Is Melonex safe for people with diabetes?
Ask first. Mayo Clinic lists diabetes medicines among possible arginine interactions (Mayo Clinic, L-arginine), while MSK and Cleveland Clinic do not name them. We found no source on Melonex and diabetes, so a doctor or pharmacist should decide.
Is Melonex safe while pregnant or breastfeeding?
The label says pregnant or nursing mothers should consult a physician before use. We found no source that tests these capsules in pregnancy, so the cautious answer is to skip them unless your doctor says otherwise.
Does Melonex interact with sildenafil or nitrates?
It may. Mayo Clinic names sildenafil and nitrates as arginine interactions, and Cleveland Clinic names nitrates (Mayo Clinic, L-arginine) (Cleveland Clinic, L-arginine). Combined effects could drop pressure too far. Ask your doctor or pharmacist before taking Melonex with either one.
Where do I report a bad reaction to Melonex?
Tell your doctor first. You can also report it to the FDA through MedWatch, its safety reporting program (FDA, MedWatch). For a placed order or a refund, call the order desk at +1 (855) 889-3137 with your order ID.
Who wrote this10
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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