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-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
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
✓ Enhanced athletic performance* — 7-day RCT in collegiate soccer players: L-citrulline + L-arginine improved cycling time trial and lowered perceived exertion vs placebo.
NIH/PubMed — Suzuki, 2019
✓ Citrulline raises arginine more efficiently* — Human crossover trial: L-citrulline increased plasma arginine more than L-arginine due to bypassing first-pass metabolism.
NIH/PMC — Agarwal, 2017
✓ Blood pressure support* — Meta-analysis of RCTs: oral L-arginine lowered systolic/diastolic BP. Dose-response confirmed in updated analysis.
NIH/PubMed — Dong, 2011
NIH/PMC — Shiraseb, 2021
✓ Improved vascular recovery after HIIT* — RCT: single 12 g citrulline dose enhanced NO biomarkers and antioxidant defenses after high-intensity interval training.
NIH/PubMed — Valaei, 2022
✓ VO₂ kinetics & endurance* — Systematic review: citrulline shows potential benefits for aerobic performance and RPE; outcomes depend on dose/training status.
NIH/PMC — Viribay, 2022
✓ Time-trial improvement* — Single-ingredient citrulline reduced 4 km cycling time and boosted arginine vs placebo.
NIH/PubMed — Suzuki, 2016
✓ Endothelial function* — Review of human studies: 800 mg/day citrulline for 8 weeks improved flow-mediated dilation in adults.
NIH/PMC — Park, 2023
Additional / Promising Evidence
✓ Strength & power (citrulline malate)* — Meta-analysis shows mixed or null effects on strength; highlights where benefits may be limited.
NIH/PubMed — Aguiar, 2022
✓ Newest RCT (2025)* — 10-day L-citrulline supplementation improved time-to-exhaustion in trained adults.
NIH/PMC — Schierbauer, 2025
✓ Immune modulation* — Arginine and citrulline influence immune cell pathways; potential benefit for recovery and immune resilience.
NIH/PubMed — Wu, 2007
University-Led & Academic Studies
✓ NO synthase pathways & substrate kinetics* — Characterized nitric oxide synthase pathways and substrate kinetics of arginine/citrulline.
NIH/PubMed — Wu, 2007
✓ Antioxidant effects of acute citrulline during HIIT* — RCT confirms vascular biomarker changes and antioxidant effects.
NIH/PubMed — Valaei, 2022
Global Evidence & Reviews
✓ Arginine fact sheet* — Outlines safety, physiological role in NO production, and current evidence for supplementation.
NIH/ODS — Arginine
✓ Meta-analyses on citrulline/arginine & vascular performance* — Highlights dose and formulation differences in effects.
NIH/PubMed — Dong, 2011
We monitor research from leading institutions —
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, Ohio State — to align with credible science.*
Key Ingredients
- 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
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!*
