Nitric Oxide Powder — L-Citrulline & L-Arginine Formula, 30 Servings — Athletic Performance & Cardiovascular Support*
LifeSource Vitamins Nitric Oxide Powder delivers L-citrulline and L-arginine, clinically studied amino acids that raise nitric oxide levels, support vasodilation, and improve blood flow for potential libido support. This performance-driven formula promotes cardiovascular health, workout endurance, faster recovery, and overall vitality.* Naturally flavored and sweetened with stevia. Produced in FDA-registered, GMP-certified facilities and
3rd-party tested for identity, purity & potency.*
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is based on human studies verified by the National Institutes of Health (NIH), a world-leading health authority, plus insights from 39 clinically respected organizations and 20 globally renowned health-focused universities.*
Clinically Studied Benefits (with research)
• Enhanced athletic performance — 7-day RCT in collegiate soccer players: L-citrulline + L-arginine improved cycling time trial and lowered perceived exertion vs placebo.
Suzuki 2019 (NIH/PubMed).
• Citrulline raises arginine more efficiently — Human crossover trial: L-citrulline increased plasma arginine more than L-arginine due to bypassing first-pass metabolism.
Agarwal 2017 (NIH/PMC).
• Blood pressure support — Meta-analysis of RCTs: oral L-arginine lowered systolic/diastolic BP. Dose-response confirmed in updated analysis.
Dong 2011 (NIH/PubMed);
Shiraseb 2021 (NIH/PMC).
• Improved vascular recovery after HIIT — RCT: single 12 g citrulline dose enhanced NO biomarkers and antioxidant defenses after high-intensity interval training.
Valaei 2022 (NIH/PubMed).
• VO₂ kinetics & endurance — Systematic review: citrulline shows potential benefits for aerobic performance and RPE; outcomes depend on dose/training status.
Viribay 2022 (NIH/PMC).
• Time-trial improvement — Single-ingredient citrulline reduced 4 km cycling time and boosted arginine vs placebo.
Suzuki 2016 (NIH/PubMed).
• Endothelial function — Review of human studies: 800 mg/day citrulline for 8 weeks improved flow-mediated dilation in adults.
Park 2023 (NIH/PMC).
Additional Studies Showing Promising Benefits*
• Strength & power (citrulline malate) — Meta-analysis shows mixed or null effects on strength; highlights where benefits may be limited.
Aguiar 2022 (NIH/PubMed).
• Newest RCT (2025) — 10-day L-citrulline supplementation improved time-to-exhaustion in trained adults.
Schierbauer 2025 (Frontiers).
• Immune modulation — Arginine and citrulline influence immune cell pathways; potential benefit for recovery and immune resilience.
Wu 2007 (NIH/PubMed).
University Studies (Promising / Mechanistic)
• UC Davis / UCSD teams — Characterized nitric oxide synthase pathways and substrate kinetics of arginine/citrulline.
Wu 2007 (NIH/PubMed).
• Cambridge University — RCT on antioxidant effects of acute citrulline during HIIT; confirms vascular biomarker changes.
Valaei 2022 (NIH/PubMed).
Global Evidence & Authoritative Reviews*
• NIH ODS (Niacin/Arginine/Citrulline) — Fact sheets outline safety, physiological role in NO, and current evidence.
NIH ODS — Arginine.
• Cochrane-style systematic reviews — Meta-analyses on citrulline/arginine and vascular performance highlight dose and formulation differences.
Dong 2011 (PubMed).
We monitor research from the world’s leading institutions — including Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State (Linus Pauling Institute), Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with credible science.*
Brief Benefit Bullets
• Boost endurance and reduce exercise fatigue*
• Amplify circulation and workout pump*
• Support healthy blood pressure and vascular function*
• Improve oxygen delivery to muscles*
• Aid faster post-training recovery*
• Naturally flavored, stevia-sweetened powder*
• 3rd-party lab tested for purity & potency*
Suggested Use
Mix 1 scoop (10.3 g) in 8–12 oz water 30–60 minutes before training, or daily for cardiovascular support. Do not exceed 2 servings/day. If taking blood pressure meds or have cardiovascular conditions, consult your physician first.*
Product Specifications
• Serving Size — 1 Scoop (10.3 g)
• Servings Per Container — 30
• L-Citrulline — 3,000 mg
• L-Arginine — 3,000 mg
• L-Proline — 1,000 mg
• L-Lysine — 150 mg
• Stevia Leaf Extract — 180 mg
• Other ingredients: citric acid, pineapple juice powder, fruit punch flavor, silica, beet juice powder
• Form — Easy-mix powder
• Free From — Artificial colors, artificial flavors, gluten*
• Quality — Third-party tested for identity, potency & purity
Perfect For
• Athletes seeking performance & recovery support*
• Adults wanting to support cardiovascular function*
• Anyone seeking improved circulation & workout endurance*
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.
Nitric Oxide Powder — L-citrulline & L-arginine for blood flow, endurance, and recovery. Great-tasting, stevia-sweetened formula. 3rd-party tested. Clinically Studied Ingredients — NIH/PubMed*
