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L-Arginine for Blood Pressure: What 11 Trials Found
L-arginine for blood pressure has one pooled answer: 11 placebo-controlled trials with 387 people, using 4 to 24 g a day, found drops of about 5.39 systolic and 2.66 diastolic mm Hg. These were trial results, not a treatment claim. Melonex's whole blend is 0.5 to 1 g a day.
Written by the Melonex label deskUpdated · 4 min read
What did the L-arginine trials find?
A pooled analysis of 11 double-blind, placebo-controlled trials found small average drops in blood pressure after oral L-arginine. The trials had 387 people and used 4 to 24 g a day (Dong 2011, arginine meta-analysis).
| Measure | Average change | 95% range |
|---|---|---|
| Systolic (top number) | -5.39 mm Hg | -8.54 to -2.25 |
| Diastolic (bottom number) | -2.66 mm Hg | -3.77 to -1.54 |
Why would an amino acid change a blood pressure reading?
L-arginine is the raw material nitric oxide synthase uses to make nitric oxide. Nitric oxide signals vessel muscle to relax, and that is the proposed route (Cziraki 2020, arginine-NO pathway).
The details are debated, and one source lists blood pressure claims for arginine as unsubstantiated (Health Library, Arginine).
See where a reading sits on the blood pressure numbers page.
How does a Melonex capsule compare with the trial doses?
A Melonex capsule holds far less arginine than any of these trials used. The two arginine lines share at most 333 mg of a 500 mg blend, and that weight includes their salt partners.
No trial has tested Melonex itself.
- Trials
4 to 24 g of L-arginine a day
- Melonex label ceiling
Under 0.7 g of arginine forms at two capsules
Melonex: from $49 a bottle60 capsules · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsWho should skip L-arginine?
People who have had a recent heart attack should not take L-arginine. Mayo Clinic does not recommend it, and the VINTAGE MI trial stopped early after 6 deaths on arginine and none on placebo (Mayo Clinic, L-arginine) (VINTAGE MI trial, JAMA 2006).
Arginine can also add to blood pressure drugs, nitrates and sildenafil and push pressure too low (Mayo Clinic, L-arginine). Keep taking prescribed medicine, and talk to your doctor before any supplement.
Can Melonex stand in for the trial doses?
No. The capsules are a small-dose supplement, not a copy of any trial. These packs have the lowest per-bottle prices.
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
How long did the L-arginine blood pressure trials last?
Durations varied, and the drops held in trials of 4 weeks or longer (Dong 2011, arginine meta-analysis). No trial ran on Melonex, so its timeline is unknown.
Does L-arginine help if I take blood pressure medicine?
The pooled result was similar in people not on medicine. Arginine may also stack with those drugs and push pressure too low, so ask your doctor first (Mayo Clinic, L-arginine).
Is 5 mm Hg a big change?
It is a modest average across groups. Individual results ranged widely, and lifestyle steps like cutting sodium also shift readings. Judge any change by home readings reviewed with your clinician.
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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