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L-Arginine After a Heart Attack: What VINTAGE MI Showed
L-arginine after a heart attack is not recommended. The VINTAGE MI trial gave 9 g a day to 153 patients, and six on arginine died versus none on placebo, so the safety committee stopped enrollment. Mayo Clinic repeats the warning. Melonex contains two arginine forms, so people with a recent heart attack should skip it.
Written by the Melonex label deskUpdated · 4 min read
What did the VINTAGE MI trial find about L-arginine after a heart attack?
The VINTAGE MI trial found no benefit from L-arginine after a heart attack and a higher death count in the arginine group. It was a randomized trial of 153 patients after a first ST-elevation heart attack (VINTAGE MI trial, JAMA 2006).
| Item | Result |
|---|---|
| Patients | 153 after a first heart attack |
| Dose | Target 9 g a day, for 6 months |
| Vessel stiffness, ejection fraction | No improvement |
| Deaths | 6 (8.6%) on arginine, none on placebo |
What happened next?
- Enrollment
Patients were randomized to arginine or placebo.
- Safety review
Deaths appeared only in the arginine group.
- Early stop
The safety committee halted enrollment, and the authors advised against arginine after a heart attack (VINTAGE MI trial, JAMA 2006).
Mayo Clinic gives the same advice: not recommended for people with a recent heart attack because it might raise the risk of death (Mayo Clinic, L-arginine).
Does the trial prove arginine caused those deaths?
No. Six deaths in one trial is a small number, and the trial was stopped before it could answer why.
The dose was 9 g a day, far above a Melonex capsule. But the warning is about the condition, not only the dose, and the label does not carve out an exception.
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See packsWhat does this mean for Melonex capsules?
It means a recent heart attack is a reason to skip Melonex. Two of its three blend lines are L-arginine forms.
The label tells people with a medical condition to consult a physician. Keep taking prescribed medicine, and call 911 for chest discomfort, shortness of breath or cold sweat (AHA, warning signs).
Who is Melonex for?
It is for healthy adults who have cleared it with a clinician. These packs cost least per bottle.
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
Can I take arginine years after a heart attack?
Sources we cite say arginine is not recommended after a recent heart attack (Mayo Clinic, L-arginine). Whether a later date changes that is a question for your cardiologist.
Why would an amino acid be risky for the heart?
The trial did not explain it. It only showed more deaths on arginine, and the authors advised against use (VINTAGE MI trial, JAMA 2006).
Does L-citrulline carry the same warning?
The warning concerns arginine. Citrulline is converted to arginine in the kidneys (Aguayo 2021, L-citrulline review), so ask your doctor before assuming it is safer.
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.
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