Catalog classification, reference sizes, lab math links, and source-backed data. Educational use only — not medical advice.
Researched for: oral arginine cardiovascular evidence
Also known as: Arginine
L-arginine is a semi-essential amino acid; a portion is converted to nitric oxide (NO), a potent vasodilator that increases blood flow and the delivery of oxygen and nutrients to skeletal muscle, per the NIH Office of Dietary Supplements Exercise and Athletic Performance fact sheet. Oral arginine undergoes substantial first-pass hepatic metabolism, limiting bioavailability compared with citrulline.
Catalog descriptions reflect research context only. Not a medical claim or treatment recommendation.
Data source: Systematic reviews of randomized oral supplementation trials
Reflects preclinical/research literature context only. Not a medical claim, dosing instruction, or treatment recommendation.
Amounts and schedules are separated by administration route. Evidence badges distinguish labels, human studies, preclinical work, community reports, and evidence gaps.
4-9 g daily in blood-pressure trials and dose-response analysis
Context: systematic review PMID 34967840
Formulation: Oral-mucosal formulations are not dose-equivalent to injectable or topical formulations.
Route safety: Research-study protocol only; it is not an approved or individualized instruction and should not be extrapolated to another route.
No route-specific amount established in the reviewed record.
Context: The catalog identifies this route, but its reviewed sources do not establish a separate amount and schedule for it.
Formulation: Route-specific sterile formulation and professional handling requirements apply; concentration cannot be inferred from an oral or topical product.
Route safety: No route-specific protocol is established. Do not infer an amount from another route, component, or formulation.
Do not convert an amount between routes. Bioavailability, formulation, sterility, monitoring, and clinical context differ by route. Research-use context only; independently verify every cited source.
Reflects patterns reported in research/community literature only. Not a safety guarantee, medical advice, or interaction warning for human use.
The updated meta-analysis found blood-pressure effects at at least 4 g daily but no significant additional effect above 9 g daily. IV GH stimulation testing is a separate medical procedure and not a supplement protocol.
Supplementary research context only. Not medical advice or a treatment recommendation.
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Published articles on this site that mention L-Arginine or one of its catalog aliases.
Research Use Only. All content is for educational and research reference only. Not medical advice, a treatment recommendation, or guidance on human use. Compounds are not FDA-approved drugs unless specifically noted.