The strongest clinical evidence used intravenous arginine, not the oral supplements sold in stores — results may not translate

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Last verified: 46 days ago

Arginine

Also known as: L-Arginine, L-Arg, Arginine sodium succinate, Arginine HCl

Evidence under review. — Not yet rated

Amino acid with some evidence for circulation support; most consumer fitness claims lack strong backing.

What it does

Arginine is an amino acid found naturally in the body and in foods like meat and nuts. One clinical trial found that intravenous arginine sodium succinate improved walking distance in patients...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose from provided studies
Found in

Optimum Nutrition 100% Gold Standard Whey, BEYOND RAW (Brand), Vitabiotics Neuromind Plus and 8 more

See full breakdown ↓ Methodology →

What the Science Says

Arginine is an amino acid found naturally in the body and in foods like meat and nuts. One clinical trial found that intravenous arginine sodium succinate improved walking distance in patients with peripheral artery disease better than a standard drug, suggesting a role in supporting blood flow. Animal research suggests it may have neuroprotective effects in certain mitochondrial disorders, and it appears in metabolic pathways linked to inflammation and cardiovascular health.

What It Doesn't Do

The provided studies don't support arginine as a muscle-builder or workout booster. Perioperative arginine supplementation did not reduce complications or mortality in cancer surgery patients. No evidence from these studies that oral arginine supplements meaningfully raise nitric oxide levels in healthy people or improve athletic performance.

Evidence-Based Benefits

Intravenous arginine sodium succinate demonstrated statistically significant superiority over pentoxifylline in improving maximum walking distance (29.4m vs 19.6m) and pain-free walking distance in peripheral artery disease patients (PMID: 41805668). L-arginine improved motor performance and extended lifespan in MFN2-deficient Drosophila models of Charcot-Marie-Tooth disease type 2A, suggesting neuroprotective potential via mitochondrial dynamics (PMID: 41932155). Perioperative arginine and omega-3 supplementation in gastrointestinal cancer surgery patients did not significantly improve postoperative infectious complications, mortality, or inflammatory markers compared to standard care (PMID: 41754168).

Weak Evidence

Effective at: No established dose from provided studies

Source: auto-research

Absorption & Bioavailability

Unknown from provided studies — the clinical trial showing vascular benefit used intravenous administration, not oral supplements, which limits conclusions about oral bioavailability.

Red Flags to Watch For

The strongest clinical evidence used intravenous arginine, not the oral supplements sold in stores — results may not translate
The surgical trial found no benefit from oral arginine supplementation, raising questions about whether oral doses are effective
Arginine is found in over 1,000 registered supplement products, but the provided research base is thin for consumer-facing claims
Animal and lab studies (Drosophila, food chemistry) dominate the provided evidence — human clinical data is very limited

Supplement

Overhyped

Nitric Boost Ultra

Supplement

Misleading

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Research Sources

PubMed
NIH DSLD

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06