L-Arginine — 500 mg, 100 Vegetarian Capsules — Supports Heart, Vascular & Circulatory Health*
LifeSource Vitamins L-Arginine (free-form) is a nitric-oxide precursor that supports healthy endothelial function, circulation, and exercise capacity.* Produced in FDA-registered, GMP-certified facilities and 3rd-party tested for identity, potency & purity. Non-GMO and gluten-free.*
Research Promise:
At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. We also reference reviews from 39 leading health organizations and insights from 20 top global universities to keep our guidance aligned with credible, evidence-based science.*
Clinically Studied Benefits
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Supports endothelial function* — Improves flow-mediated dilation (FMD) when baseline FMD is low. (NIH/PubMed, Bai Y, 2009)
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Helps maintain healthy blood pressure* — Meta-analysis of RCTs shows reductions in SBP/DBP. (NIH/PubMed, Li X, 2022)
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Supports erectile function (vasculogenic, mild–moderate)* — RCTs reported improvement vs placebo/no treatment. (NIH/PubMed, Sansone A, 2019)
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Supports cognitive performance in older adults with hypertension* — Improvement observed after oral L-arginine. (NIH/PubMed, Izzo C, 2022)
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Supports walking performance in exertional leg discomfort* — Improved vascular reactivity and walking distance. (NIH/PubMed, Maxwell AJ, 2007)
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Improves endothelial function in very old adults* — Normalized L-arginine/ADMA ratio and enhanced dilation. (NIH/PubMed, Bode-Böger SM, 2003)
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Supports wound-healing parameters with nutrition support* — Improved outcomes when included in oral nutrition. (NIH/PubMed, Cereda E, 2019)
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Supports immune function markers* — Meta-analysis indicates favorable effects on selected immune outcomes. (NIH/PubMed, McDaniel JC, 2014)
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Enhances NO-mediated vasodilation* — Increased NO-dependent, flow-induced vasodilation. (NIH/PubMed, Böger RH, 1998)
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Supports acute endothelial function in essential hypertension* — Oral arginine improved endothelium-dependent dilation. (NIH/PubMed, Nardin C, 2020)
Additional / Promising Evidence*
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L-Arginine (free-form)* — May support exercise performance (NO-related ergogenic effects, results mixed). (NIH/PubMed, Alvares TS, 2020)
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L-Arginine (free-form)* — May aid walking distance in short-term use (select trials reported improvements). (NIH/PubMed, Böger RH, 1998)
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L-Arginine (free-form)* — May modulate arginine/NO pathway in recovery settings (with vitamin C). (NIH/PubMed, Marzatico F, 2023)
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L-Arginine (free-form)* — Evidence for endurance outcomes remains inconsistent (source, dose, training status matter). (NIH/PubMed, Santos RS, 2021)
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L-Arginine (free-form)* — May support cardiovascular recovery (preliminary data). Study Match Pending Review
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L-Arginine (free-form)* — May enhance metabolic health (early human studies). Study Match Pending Review
University / Academic Context
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University of California, San Francisco — Researches nitric oxide and vascular health.
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Johns Hopkins — Studies amino acids in circulatory support.
Global Evidence & Authoritative Reviews
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American Heart Association (AHA) — Provides guidelines on amino acid support for cardiovascular health.
We monitor research from leading institutions — Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, the University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, and Ohio State — to keep our guidance aligned with credible science.*
Key Ingredient
L-Arginine (free-form) — Nitric-oxide precursor that supports endothelium-dependent vasodilation and vascular health. (NIH/PubMed, Nardin C, 2020)
Brief Benefit Bullets
- Supports heart & vascular health*
- Helps maintain healthy blood pressure*
- Supports healthy circulation & endothelial function*
- Nitric-oxide precursor for workout support*
- Pure, free-form amino acid*
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3rd-party lab tested for purity & potency
Suggested Use
See product label for full instructions, or as directed by your healthcare professional. Do not exceed recommended dose. If pregnant, nursing, taking medications, or have a medical condition, consult your physician.*
Product Specifications
- Serving Size — 2 Vegetarian Capsules
- Servings Per Container — 50
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Form — Vegetarian Capsules
- Free From — Non-GMO; not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree-nut ingredients*
- Quality — Third-party tested for identity, potency & purity
LifeSource Vitamins — Proudly American — Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L-Arginine 500 mg - nitric oxide precursor for heart & vascular health, circulation & healthy blood pressure. 3rd-party tested. Clinically Studied Ingredients | NIH/PubMed!*
