Nitric Oxide Precursor
amino acids
Nitric oxide precursors, primarily L-arginine and L-citrulline, are amino acids that enhance the production of nitric oxide in the body, a critical signalling molecule for vascular function. These compounds improve blood flow, endothelial health, and oxygen delivery to tissues throughout the body.
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Benefits
Dosage
Typical Dose
5-10g daily
Upper Limit
15g daily
Timing
30-60 minutes before exercise or split into two doses
Forms & Bioavailability
L-Citrulline
Superior bioavailability; converts to L-arginine in kidneys; more stable than L-arginine
L-Arginine
Moderate bioavailability; directly stimulates nitric oxide synthase but may be degraded by arginase
Citrulline Malate
Enhanced bioavailability with added malic acid; supports ATP production
Side Effects
Interactions
Research Summary
Research demonstrates that nitric oxide precursors improve vascular function, blood pressure regulation, and exercise performance in both athletic and clinical populations. Studies show L-citrulline particularly effective for endothelial dysfunction and hypertension, whilst both compounds enhance blood flow and oxygen utilisation. Evidence supports their use for cardiovascular health and exercise capacity, though individual responses vary.
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The Bottom Line on Nitric Oxide Precursor
Nitric Oxide Precursor is well-researched with strong evidence supporting its primary benefits.It is most commonly used for enhanced blood flow and circulation and improved endothelial function. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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