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Arginine & Citrulline 500 mg/250 mg

NOW Sports
4.6
★ ★ ★ ★ ★
(7855 ratings)
Citrulline 250 mg
Arginine 500 mg
Product Image
Score91

A synergistic blend of arginine and citrulline that supports healthy blood flow and nitric oxide levels.

How scoring works
Quantity:120 Capsule(s) • (120 servings)
Goals:

Score 91

A synergistic blend of arginine and citrulline that supports healthy blood flow and nitric oxide levels.

How scoring works

Also available as

1 option
240 servings Arginine 500 mg, Citrulline 250 mg • 240 Capsule(s) • 240 servings $23.76 ($0.09 per serving)
$15.60($0.13 per serving)
Daily Vita
$ 15.60
iHerb
$ 16.52
Vitacost
$ 15.93
Amazon
$ 15.60
Pure Formulas
$ 16.06
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Analysis

This formula combines 500mg of L-arginine with 250mg of L-citrulline. Because the body processes these two amino acids differently, they can work together to support nitric oxide levels over a longer period. This pairing may help maintain healthy blood flow more effectively than arginine alone.

It is a balanced supplement for those who want to try 'stacking' amino acids for circulatory health. The capsule form is convenient for daily use.

Pros

  • Combines two nitric oxide precursors
  • Synergistic amino acid profile
  • Convenient capsule form
  • 120 servings per bottle

Cons

  • Citrulline dose is relatively low
  • Requires multiple capsules for high-performance needs
  • Gelatin-based capsules

Warnings

  • Consult a professional if you have low blood pressure
  • Discontinue use if you experience dizziness
  • Keep out of reach of children

Nutrient quality

83 Highest impact

The combination of Arginine and Citrulline supports the nitric oxide pathway more effectively than Arginine alone. However, the Citrulline dose is lower than what is typically recommended for significant athletic performance improvements.

Ingredient transparency

97 Highest impact

Active ingredients and their respective doses are clearly stated without the use of obfuscating blends. Labeling practices align with high industry standards for clarity and specificity.

Customer satisfaction

92 Highest impact

A very large volume of reviews supports the reliability and general effectiveness of this formulation. Customer ratings are consistently high, suggesting the product meets user expectations for basic circulatory support.

Value for money

93 Highest impact

The price per serving is exceptionally competitive for a foundational amino acid supplement. It offers high value for those looking for a cost-effective way to support nitric oxide levels daily.

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Ingredients

IngredientAmount per serving
L-Arginine
500 mg
L-Citrulline
250 mg
Gluten Free Adults 18–50 Kosher Dairy Free
Report overview
Citrulline · 250 mg OverallScore64
A+ Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyD- Value
This capsule-based complex from NOW Sports provides a low dose of L-Citrulline alongside Arginine. It is best used for basic metabolic support rather than athletic performance improvement.
View ingredientView products
Arginine · 500 mg OverallScore63
C+ Active Ingredient Quality & BioavailabilityD+ Dose, Safety & Label TransparencyB+ Value
Combining arginine and citrulline can enhance nitric oxide production more effectively than either alone. This supplement provides a foundational dose for those exploring synergistic amino acid support.
View ingredientView products
92 Value

Arginine & Citrulline 500 mg / 250 mg

NOW Sports
4.7
★★★★★
(8172 ratings)
Choosing the larger volume version of the same synergistic formula significantly improves long-term value for daily users. It maintains the reliable ratio of amino acids while offering a more economical way to support vascular flexibility over time.
Other sellers (4)
96 Value

L-Citrulline 1000 mg

Nutricost
4.6
★★★★★
(520 ratings)
Offering a concentrated dose of citrulline in a high-quality capsule provides superior value for those seeking sustained circulatory support. The high dose per serving ensures clinical-level nutrient delivery while remaining very affordable.
Other sellers (1)
92 Value

L-Arginine L-Citrulline Complex

Source Naturals
4.6
★★★★★
(4012 ratings)
Utilizing a tablet format in a bulk count provides a higher concentration of arginine hydrochloride per serving for better overall value. This selection ensures a long-term supply of the building blocks needed for consistent nitric oxide production.
Other sellers (2)
97 Performance

L-Citrulline 2000 mg

AN Amazing Nutrition Amazing Formulas
4.4
★★★★★
(1269 ratings)
Providing a potent 2000mg dose of pure citrulline offers much more robust support for vascular performance and endothelial function than lower-dose blends. Higher citrulline intake is often more efficient for sustaining long-term nitric oxide levels in the body.
Other sellers (2)
93 Performance

N.O. Pro with Beet Root

ZHOU
4.2
★★★★★
(3554 ratings)
Blending multiple forms of arginine, including alpha-ketoglutarate, with citrulline malate and beet root creates a more comprehensive pathway for nitric oxide support. The addition of dietary nitrates from beet root works synergistically with the amino acids to support physical endurance.
Other sellers (4)
95 Performance

L-Arginine 3000 mg

Natrol
4.5
★★★★★
(8160 ratings)
Supplying a high dose of arginine alongside essential B vitamins like folate and B12 provides a multifaceted approach to cardiovascular health. This combination supports both vascular tone and healthy metabolic pathways more effectively than a basic amino acid pair.
Other sellers (3)
92 Budget

L-Arginine + L-Citrulline 750 mg

Nutricost
4.7
★★★★★
(1904 ratings)
Maintaining the same synergistic ratio of amino acids in a bulk-count format provides a significantly more affordable way to support circulatory health. It ensures consistent daily delivery of nitric oxide precursors at a fraction of the cost.
Other sellers (0)
92 Budget

L-Arginine L-Citrulline Complex 1000 mg

Best Naturals
4.8
★★★★★
(154 ratings)
Using a tablet format allows for a higher concentration of arginine hydrochloride while remaining highly cost-effective for daily maintenance. It supports healthy blood flow and vascular tone through a reliable and economical amino acid blend.
Other sellers (0)
94 Budget

L-Arginine 500 mg

California Gold Nutrition
4.7
★★★★★
(10698 ratings)
Focusing on a single-ingredient arginine formula in a large bottle format reduces the price per serving while still supporting foundational nitric oxide levels. It provides a clean and simple approach to maintaining vascular wellness.
Other sellers (1)
92 Value

Arginine & Citrulline 500 mg / 250 mg

NOW Sports
4.7
★★★★★
(8172 ratings)
Choosing the larger volume version of the same synergistic formula significantly improves long-term value for daily users. It maintains the reliable ratio of amino acids while offering a more economical way to support vascular flexibility over time.
Other sellers (4)
96 Value

L-Citrulline 1000 mg

Nutricost
4.6
★★★★★
(520 ratings)
Offering a concentrated dose of citrulline in a high-quality capsule provides superior value for those seeking sustained circulatory support. The high dose per serving ensures clinical-level nutrient delivery while remaining very affordable.
Other sellers (1)
92 Value

L-Arginine L-Citrulline Complex

Source Naturals
4.6
★★★★★
(4012 ratings)
Utilizing a tablet format in a bulk count provides a higher concentration of arginine hydrochloride per serving for better overall value. This selection ensures a long-term supply of the building blocks needed for consistent nitric oxide production.
Other sellers (2)
97 Performance

L-Citrulline 2000 mg

AN Amazing Nutrition Amazing Formulas
4.4
★★★★★
(1269 ratings)
Providing a potent 2000mg dose of pure citrulline offers much more robust support for vascular performance and endothelial function than lower-dose blends. Higher citrulline intake is often more efficient for sustaining long-term nitric oxide levels in the body.
Other sellers (2)
93 Performance

N.O. Pro with Beet Root

ZHOU
4.2
★★★★★
(3554 ratings)
Blending multiple forms of arginine, including alpha-ketoglutarate, with citrulline malate and beet root creates a more comprehensive pathway for nitric oxide support. The addition of dietary nitrates from beet root works synergistically with the amino acids to support physical endurance.
Other sellers (4)
95 Performance

L-Arginine 3000 mg

Natrol
4.5
★★★★★
(8160 ratings)
Supplying a high dose of arginine alongside essential B vitamins like folate and B12 provides a multifaceted approach to cardiovascular health. This combination supports both vascular tone and healthy metabolic pathways more effectively than a basic amino acid pair.
Other sellers (3)
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