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L-Arginine 3000 mg

Natrol
4.5
★ ★ ★ ★ ★
(8158 ratings)
Arginine 3000 mg
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Score80
A substantial arginine serving and supporting B vitamins provide strong dose depth at good value. Three tablets and blood-pressure interaction risk require consideration.
How scoring works
Quantity:90 Tablet(s) • (30 servings)
Goals:
Cardiovascular Support
Energy
Fitness

Score 80

A substantial arginine serving and supporting B vitamins provide strong dose depth at good value. Three tablets and blood-pressure interaction risk require consideration.
How scoring works
$13.28($0.44 per serving)
iHerb
$ 14.99
iHerb
$ 14.99
Vitacost
$ 14.99
Amazon
$ 13.28
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Analysis

A three-tablet serving supplies 3,000 mg of L-arginine, a substantial amount for nitric-oxide and circulation support, alongside vitamins B6, folate, and B12. L-arginine is a nitric-oxide precursor, so it may support blood-vessel relaxation and circulation without acting as a stimulant.

The B vitamins add secondary metabolic support, but the tablets use no stated sustained-release technology and create a moderate pill burden. The active amount is highly competitive for the cost and best suited to users deliberately seeking a larger serving for circulation or fitness use.

The formula fits adults who want focused arginine support and can adjust intake to the stated serving size. L-arginine may add to the blood-pressure-lowering effects of nitrates or antihypertensive medicines, increasing the chance of dizziness or an excessive pressure drop.

Who is it for
  • Adults seeking focused circulation support
  • Users who prefer a clearly measured arginine serving
  • People comfortable adjusting intake to their needs
Best for
  • Nitric-oxide precursor support
  • General circulation support
  • Flexible amino-acid supplementation

Pros

  • Substantial 3,000 mg arginine amount
  • Includes B6, folate, and B12
  • Excellent active-amount value

Cons

  • Three-tablet serving
  • No sustained-release feature
  • B vitamins do not broaden nitric-oxide delivery

Warnings

  • L-arginine may add to the blood-pressure-lowering effects of nitrates or antihypertensive medicines, increasing the chance of dizziness or an excessive pressure drop.
  • The substantial amount may increase the chance of stomach upset or lightheadedness in sensitive users.

Nutrient quality

83 Highest impact

Standard L-arginine is paired with conventional B-vitamin forms but no sustained-release technology. The arginine amount is substantial and aligned with targeted circulation or fitness use.

Ingredient transparency

78 High impact

Every listed active ingredient has a specific disclosed amount. Non-active ingredients and excipients are not provided.

Customer satisfaction

72 High impact

The supplied average rating is strong. The large rating sample provides strong statistical confidence.

Value for money

85 Highest impact

The substantial dose provides strong core quality despite basic release and ordinary vitamin forms. The serving cost offers good value for the active amount delivered.

Report analysis

Goals

Cardiovascular Support
Impact
Highest effect
B+ Goal FitA- Strength of SupportB- CoverageA Formula Quality
Arginine · 3000 mgVitamin B12 · 50 mcgVitamin B6 · 10 mgFolate · 333 mcg DFE

Three grams of L-arginine directly supports nitric-oxide production and may improve blood-vessel dilation. B6, folate, and B12 add a secondary homocysteine pathway, though cyanocobalamin is a less preferred B12 form.

All amounts are clearly disclosed and the arginine dose is meaningful. L-arginine can lower blood pressure, so combining it with antihypertensive medicines or nitrate drugs may increase dizziness or fainting risk.

Study evidence
Arginine Supportive 47 studies
Folate Supportive 93 studies
Energy
Impact
High effect
B- Goal FitB Strength of SupportC+ CoverageA Formula Quality
Vitamin B12 · 50 mcg

Arginine supports nitric-oxide production and blood flow, while B vitamins contribute to normal energy metabolism. The amino acid amount is substantial.

Exercise-energy evidence for oral arginine is less consistent than for citrulline. The formula is focused on circulation and does not address broader mitochondrial or deficiency pathways.

Study evidence
Arginine No effect 7 studies
Fitness
Impact
Moderate effect
C Goal FitB- Strength of SupportD+ CoverageB- Formula Quality
Arginine · 3000 mg

Arginine offers a direct nitric-oxide pathway that may support exercise blood flow, but its performance evidence is inconsistent. The disclosed amount is meaningful yet still less dependable than citrulline for raising circulating arginine.

The vitamin additions do not materially broaden performance support for most well-nourished users. The focused and transparent label is easy to assess, though the product remains narrow for a broad fitness goal.

Study evidence
Arginine No effect 23 studies

Ingredients

IngredientAmount per serving
Vitamin B6 (Pyridoxine Hydrochloride)
10 mg
Folate
333 mcg DFE
Vitamin B12 (Cyanocobalamin)
50 mcg
L-Arginine
3000 mg
Men 18–50 Dairy Free Vegetarian
Report overview
Arginine · 3000 mg OverallScore80
C- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyA+ Value

The standard L-arginine form reaches a strong fitness-focused dose, though the tablets use no stated sustained-release technology. Three tablets create a moderate pill burden but deliver the full amount in one serving. The large active amount and low cost per gram provide excellent value, while the dose may add to blood-pressure-lowering effects from nitrates or antihypertensive medicines.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Investigation of the effect of nitrate and L-arginine intake on aerobic, anaerobic performance, balance, agility, and recovery in elite taekwondo athletes.
    Kavcı Z; Ozan M; Buzdağlı Y; Savaş A; Uçar H · Journal of the International Society of Sports Nutrition · 2024
    Randomized trial15 participantsEnergy forArginine
  2. Effect of Arginine Supplementation on Vasodilation and Muscular Performance in Young Men: A Randomized, Double-Blind, Crossover Study.
    Borges CC; Alves da Silva W; de Sá Filho AS; Aprigliano V; Inacio PA; Silveira M; Ferrari G · International journal of sport nutrition and exercise metabolism · 2025
    Randomized trial16 participantsEnergy forArginine
  3. The effect of L-arginine supplementation on maximal oxygen uptake: A systematic review and meta-analysis.
    Rezaei S; Gholamalizadeh M; Tabrizi R; Nowrouzi-Sohrabi P; Rastgoo S; Doaei S · Physiological reports · 2021
    Meta-analysis11 studies pooledFitness forArginine
  4. Acute L-arginine alpha ketoglutarate supplementation fails to improve muscular performance in resistance trained and untrained men.
    Wax B; Kavazis AN; Webb HE; Brown SP · Journal of the International Society of Sports Nutrition · 2012
    Randomized trial16 participantsFitness forArginine
  5. Effect of Long-Term L-Arginine Supplementation on Arterial Compliance and Metabolic Parameters in Patients with Multiple Cardiovascular risk Factors: Randomized, Placebo-Controlled Study.
    Guttman H; Zimlichman R; Boaz M; Matas Z; Shargorodsky M · Journal of cardiovascular pharmacology · 2024
    Randomized trial90 participantsCardiovascular Support forArginine
  6. Atorvastatin but not L-arginine improves endothelial function in type I diabetes mellitus: a double-blind study.
    Mullen MJ; Wright D; Donald AE; Thorne S; Thomson H; Deanfield JE · Journal of the American College of Cardiology · 2000
    Randomized trial84 participantsCardiovascular Support forArginine
  7. Reassessment of the effect of oral l-arginine on blood pressure: A systematic review and meta-analysis based on ambulatory blood pressure monitoring.
    Shi Y; Liu Y; Zhou Z; Xu S; Luo P · Nitric oxide : biology and chemistry · 2026
    Meta-analysis202 participants5 studies pooledCardiovascular Support forArginine
  8. Increase in fasting vascular endothelial function after short-term oral L-arginine is effective when baseline flow-mediated dilation is low: a meta-analysis of randomized controlled trials.
    Bai Y; Sun L; Yang T; Sun K; Chen J; Hui R · The American journal of clinical nutrition · 2009
    Meta-analysis492 participants13 studies pooledCardiovascular Support forArginine
  9. L-arginine improves endothelial function and reduces LDL oxidation in patients with stable coronary artery disease.
    Yin WH; Chen JW; Tsai C; Chiang MC; Young MS; Lin SJ · Clinical nutrition (Edinburgh, Scotland) · 2006
    Randomized trial31 participantsCardiovascular Support forArginine
  10. Oral L-Arginine Administration Improves Anthropometric and Biochemical Indices Associated With Cardiovascular Diseases in Obese Patients: A Randomized, Single Blind Placebo Controlled Clinical Trial.
    Dashtabi A; Mazloom Z; Fararouei M; Hejazi N · Research in cardiovascular medicine · 2016
    Randomized trial90 participantsCardiovascular Support forArginine
  11. Associations of dietary folate, vitamin B6 and B12 intake with cardiovascular outcomes in 115664 participants: a large UK population-based cohort.
    Zhang B; Dong H; Xu Y; Xu D; Sun H; Han L · European journal of clinical nutrition · 2023
    Cohort study115,664 participantsCardiovascular Support forFolate
  12. Folate, Homocysteine, and Adverse Outcomes After Ischemic Stroke.
    Shi M; Zheng J; Liu Y; Mao X; Wu X; Chu M; Niu H; Sun L; Chang X; He Y; Liu Y; Guo D; Zhang Y; Zhu Z; Zhao J · Journal of the American Heart Association · 2024
    Cohort study3,530 participantsCardiovascular Support forFolate
  13. Effect of folic acid on endothelial function following acute myocardial infarction.
    Moens AL; Claeys MJ; Wuyts FL; Goovaerts I; Van Hertbruggen E; Wendelen LC; Van Hoof VO; Vrints CJ · The American journal of cardiology · 2007
    Randomized trial40 participantsCardiovascular Support forFolate
  14. Folic acid enhances endothelial function and reduces blood pressure in smokers: a randomized controlled trial.
    Mangoni AA; Sherwood RA; Swift CG; Jackson SH · Journal of internal medicine · 2003
    Randomized trial24 participantsCardiovascular Support forFolate
  15. 5-methyltetrahydrofolate, the active form of folic acid, restores endothelial function in familial hypercholesterolemia.
    Verhaar MC; Wever RM; Kastelein JJ; van Dam T; Koomans HA; Rabelink TJ · Circulation · 1998
    Non-randomized trial20 participantsCardiovascular Support forFolate
  16. The Effects of Arginine-Based Supplements on Fatigue Levels following COVID-19 Infection: A Prospective Study in Romania.
    Turcu-Stiolica A; Ionele CM; Ungureanu BS; Subtirelu MS · Healthcare (Basel, Switzerland) · 2023
    Non-randomized trial505 participantsEnergy forArginine
  17. Isolated but not combined ergogenic effects of caffeine and L-arginine during an isokinetic knee extension.
    Zart S; Brachtendorf M; Becker S; Fröhlich M · Frontiers in nutrition · 2024
    Randomized trial29 participantsEnergy forArginine
  18. L-Arginine but not L-glutamine likely increases exogenous carbohydrate oxidation during endurance exercise.
    Rowlands DS; Clarke J; Green JG; Shi X · European journal of applied physiology · 2012
    Randomized trial8 participantsEnergy forArginine
  19. Effect of L-arginine on energy metabolism, skeletal muscle and brown adipose tissue in South Asian and Europid prediabetic men: a randomised double-blinded crossover study.
    Boon MR; Hanssen MJW; Brans B; Hülsman CJM; Hoeks J; Nahon KJ; Bakker C; van Klinken JB; Havekes B; Schaart G; Jazet IM; Rensen PCN; van Marken Lichtenbelt WD · Diabetologia · 2019
    Randomized trial20 participantsEnergy forArginine
  20. L-Arginine Enhances the Effects of Cardiac Rehabilitation on Physical Performance: New Insights for Managing Cardiovascular Patients During the COVID-19 Pandemic.
    Mone P; Izzo R; Marazzi G; Manzi MV; Gallo P; Campolongo G; Cacciotti L; Tartaglia D; Caminiti G; Varzideh F; Santulli G; Trimarco V · The Journal of pharmacology and experimental therapeutics · 2022
    Clinical trialFitness forArginine
  21. THE EFFECT OF A SINGLE ORAL DOSE OF L-ARGININE ON QUADRICEPS STRENGTH IN SMOKERS AND NON-SMOKERS: A NON-RANDOMIZED CLINICAL TRIAL.
    Radmilović G; Popović-Grle S; Matijević V · Acta clinica Croatica · 2025
    Non-randomized trial164 participantsFitness forArginine
  22. Efficacy of amino acids in sports nutrition- review of clinical evidences.
    Duttagupta S; Krishna Roy N; Dey G · Food research international (Ottawa, Ont.) · 2024
    Narrative reviewFitness forArginine
  23. Chronic L-arginine supplementation enhances endurance exercise tolerance in heart failure patients.
    Doutreleau S; Mettauer B; Piquard F; Rouyer O; Schaefer A; Lonsdorfer J; Geny B · International journal of sports medicine · 2006
    Non-randomized trialFitness forArginine