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L-Arginine for Erectile Dysfunction: What Trials Show
Small trials tested L-arginine for erectile dysfunction, mostly at 3 to 5 g a day, and one review called them pilot-level rather than proof (Koolwal 2019, L-arginine and ED). Stallion Power lists L-arginine seventh in an 82 mg blend, so by label arithmetic it weighs at most 11.7 mg per gummy, hundreds of times below those doses.
Written by the Stallion Power label deskUpdated · 4 min read
What have trials of L-arginine for ED found?
L-arginine has more human trials than most herbs in male enhancement products, but they are small and the authors call them pilot work.
A narrative review found 14 human trials of L-arginine, alone or mixed with other agents, for erectile dysfunction. Sample sizes were small and many were pilot studies. The authors said the studies should be seen as pilot research, not full evidence of efficacy, and that larger well-designed trials are needed (Koolwal 2019, L-arginine and ED).
A separate review of ingredients in ED supplements said L-arginine is a safe supplement with clinical data supporting improved erectile function, but also that ED supplements remain poorly studied overall (Srivatsav 2020, Aphrodisiac ingredients review). Both statements can be true. The data lean positive and still fall short of proof.
Memorial Sloan Kettering lists ED only as a purported use of arginine and gives no ED findings (MSK, Arginine). Marketers link arginine to nitric oxide. The sources we read do not lay out that mechanism, so we leave it out.
What doses were used?
| Dose per day | What the review reported |
|---|---|
| 1.5 g | Ineffective for ED |
| 3 g or less | Generally ineffective |
| 5 g for 6 weeks | Used in one study |
| 9 g or less | Generally well tolerated by mouth |
All figures come from one review (Koolwal 2019, L-arginine and ED). The reported side effects were nausea or vomiting in about 3 percent of users, possible small drops in blood pressure, and bloating or cramps. Memorial Sloan Kettering lists abdominal pain, bloating, nausea and diarrhea (MSK, Arginine).
How does that compare with a gummy?
The Stallion Power label lists L-arginine seventh in an 82 mg proprietary blend and prints no amount for it. Blend lines go in descending order by weight (21 CFR 101.36, Supplement Facts). Seventh place caps it at 82 divided by 7, or 11.7 mg. Caffeine is printed at 5 mg in fifth place, and lines six to nine cannot weigh more than that, so the tighter ceiling is 5 mg.
A 3,000 mg study dose is 600 times the tighter ceiling of 5 mg. Even the plain ceiling is more than 250 times smaller. Study doses cannot be compared with a whole 82 mg blend.
This is arithmetic on a printed label, not a lab result, and it assumes the label follows the ordering rule. A real gummy can hold less. See the L-arginine page for the full line.
Stallion Power: from $49 a bottle30 gummies a bottle · 2, 3 or 6 bottles · free shipping on 3 or 6 · 60-day guarantee
See packsWho should be careful?
- Blood pressure medicines: arginine could temporarily lower blood pressure in a small study, so effects can add up (MSK, Arginine).
- Recent heart attack: Memorial Sloan Kettering warns arginine may raise the risk of death in people who had an acute heart attack (MSK, Arginine).
- ED drugs or nitrates: ask a doctor or pharmacist first. Sildenafil must not be taken with nitrates (MedlinePlus, Sildenafil).
Keep taking prescribed medicine. Nothing here replaces a doctor's visit.
A sensible next step
ED has many causes, including diabetes and heart and blood vessel disease (NIDDK, ED causes). Before you spend money on a supplement, read ED causes and when to see a doctor and bring your questions to a clinician.
Who wrote this01
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, FTC, NIDDK, AHA and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by Gostallionpower, a Stallion Power U.S. merchant desk, not by the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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