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Vein Erect with L-Arginine & Maca

Mason Natural
4.0
★ ★ ★ ★ ★
(610 ratings)
Arginine 2500 mg
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Score75
A substantial arginine amount is paired with modest maca additions at good value. Four capsules and medication interactions narrow its fit.
How scoring works
Quantity:80 Capsule(s) • (20 servings)
Goals:
Cardiovascular Support
Energy

Score 75

A substantial arginine amount is paired with modest maca additions at good value. Four capsules and medication interactions narrow its fit.
How scoring works
$11.43($0.57 per serving)
iHerb
$ 13.27
Pure Formulas
$ 14.66
Vitacost
$ 14.13
Amazon
$ 11.43
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Analysis

Four capsules provide 2,500 mg of L-arginine hydrochloride with two modest maca entries, giving the formula substantial nitric-oxide support and limited additional adaptogenic depth. L-arginine is a nitric-oxide precursor, so it may support blood-vessel relaxation and circulation without acting as a stimulant.

The arginine amount is useful, but no sustained-release feature is stated and the four-capsule serving creates a notable pill burden. Favorable cost per gram suits users who specifically want arginine and maca together, although a single-active formula would be more focused.

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 2,500 mg arginine amount
  • Clearly identifies the hydrochloride form
  • Includes maca
  • Favorable cost per gram

Cons

  • Four capsules per serving
  • Maca amounts are modest
  • Less focused than plain arginine

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.
  • Arginine may add to blood-pressure lowering from phosphodiesterase inhibitors, increasing the chance of dizziness.

Nutrient quality

82 Highest impact

L-arginine hydrochloride is clear, while one maca entry has an extract ratio and the other lacks form detail. The arginine amount is substantial, while both maca contributions are modest.

Ingredient transparency

79 High impact

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

Customer satisfaction

63 Moderate impact

The supplied average rating is weak. The substantial rating sample provides good statistical confidence.

Value for money

73 High impact

The substantial arginine dose supports quality, while modest maca additions dilute focus. The moderate serving cost is reasonable for the active amount but not exceptional.

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Goals

Cardiovascular Support
Impact
High effect
B Goal FitB Strength of SupportC- CoverageB+ Formula Quality
Arginine · 2500 mg

L-arginine directly supports nitric oxide production and blood-vessel relaxation. The clearly stated amount is meaningful, though it falls below many targeted daily regimens and evidence for sustained cardiovascular benefits is mixed.

The formula focuses mainly on endothelial blood flow, with maca adding little direct cardiovascular depth. L-arginine may amplify blood-pressure lowering from nitrates, phosphodiesterase inhibitors, or antihypertensive medicines.

Study evidence
Arginine Supportive 47 studies
Energy
Impact
High effect
C Goal FitB Strength of SupportC- CoverageB- Formula Quality

Arginine may support blood flow and exercise-related nutrient delivery, giving it some physical-vitality relevance. The disclosed amount is substantial, while maca adds a separate traditional stamina pathway.

Arginine evidence for everyday energy is less direct than evidence for creatine, caffeine, or correction of nutrient deficiency. The two maca entries are modest and add uncertain depth rather than a reliable second pathway.

Study evidence
Arginine No effect 7 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate)
50 mg
L-Arginine Hydrochloride
2500 mg
Maca
100 mg
Maca 4:1 extract
100 mg
Men 50+ Gluten Free Men 18–50
Report overview
Arginine · 2500 mg OverallScore75
C+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyB+ Value

The serving provides a strong amount of clearly identified L-arginine hydrochloride. Four capsules are required, and no sustained-release feature is stated. Cost per gram is favorable, although maca makes the formula less focused than a single-ingredient arginine product.

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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. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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