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Arginine & Citrulline 500 mg/250 mg

NOW Sports
4.6
★ ★ ★ ★ ★
(8129 ratings)
Arginine 500 mg
Citrulline 250 mg
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Score77
Clear forms and low cost are appealing, but one capsule supplies only a small fraction of a performance-oriented dose.
How scoring works
Quantity:120 Capsule(s) • (120 servings)
Goals:

Score 77

Clear forms and low cost are appealing, but one capsule supplies only a small fraction of a performance-oriented dose.
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
Amazon
$ 16.39
Vitacost
$ 17.17
Pure Formulas
$ 16.06
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Analysis

One capsule provides 500 mg of L-arginine and 250 mg of L-citrulline. The two amino acids work along the same nitric-oxide pathway, with citrulline helping sustain arginine availability.

Form quality is appropriate, but the serving is small compared with amounts commonly used for circulation or performance. Increasing the dose enough to close that gap would raise pill burden and make the label serving less informative.

A low ongoing cost and large bottle make the product easy to use as a modest daily amino-acid addition. It is less suitable for athletes expecting a strong pre-workout effect from one capsule.

Who is it for
  • Adults seeking low-dose nitric-oxide support
  • People who prefer capsules to powders
  • Users comfortable adjusting a multi-capsule intake
Best for
  • Modest daily amino-acid support
  • Low-cost trial use
  • People not expecting a strong workout effect

Pros

  • Uses pure L-arginine and L-citrulline
  • Each amount is clearly disclosed
  • Low cost per labeled serving

Cons

  • Arginine amount is low
  • Citrulline amount is far below performance use
  • Meaningful dosing would require many capsules

Warnings

  • Arginine and citrulline may add to nitrates, blood-pressure medicines, or PDE-5 inhibitors and cause dizziness or excessive blood-pressure lowering.
  • Arginine can trigger herpes simplex recurrences in some susceptible users.
  • Higher amino-acid intake may cause nausea, cramping, or diarrhea.

Nutrient quality

75 High impact

The clearly named amino acids form a coherent nitric-oxide combination. Very low amounts substantially limit practical dose quality.

Ingredient transparency

81 Highest impact

Active quantities and amino-acid forms are clearly disclosed without a hidden blend. Missing full directions and non-active ingredients leave the label incomplete.

Customer satisfaction

71 High impact

The supplied average rating is strong and the rating volume is substantial. No specific experience details were provided to judge repeated complaints or purpose alignment.

Value for money

77 High impact

The formula provides fair value for its cost. It remains moderately competitive but does not clearly lead the category.

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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
Arginine · 500 mg OverallScore59
C+ Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyB+ Value

The combination clearly discloses 500 mg of L-arginine plus 250 mg of L-citrulline, but the arginine serving remains low by itself. Citrulline may complement nitric-oxide support, although it does not change the collection-specific arginine dose. Cost efficiency for arginine is good, while several capsules are needed for a larger intake.

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Citrulline · 250 mg OverallScore52
B- Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyD- Value

Pure L-citrulline is the preferred active form, and the label states its amount clearly. The 250 mg serving is far below amounts typically used for targeted nitric-oxide or exercise support. Cost per gram is moderate, but the low dose would require many capsules to reach a meaningful intake.

View ingredientView products
Loading alternative details
67 Performance

Pump-Ocalypse Blue Raz

Bucked Up
Glycerol, citrulline, arginine, and agmatine form a coherent stimulant-free pump formula, but several amounts are moderate rather than full strength. An opaque mushroom blend and low betaine amount weaken dose quality and disclosure. Compared with the original, its Arginine and Citrulline coverage and stronger formulation depth make it a better quality-focused match.
74 Performance

Wellness ImmuNitric

Source Naturals
A substantial arginine amount with modest citrulline and B-vitamin support creates a coherent vascular formula at favorable value. Duplicate folate entries reduce clarity, and the three-tablet serving may add to the effects of nitrates or blood-pressure medicines. Compared with the original, its Arginine and Citrulline coverage and stronger formulation depth make it a better quality-focused match.
78 Performance

Arginine & Citrulline 500 mg / 250 mg

NOW Sports
A large supply of clearly disclosed L-arginine and L-citrulline offers efficient routine value. Very low serving amounts mean targeted nitric-oxide or exercise use would require many capsules. Compared with the original, its Arginine and Citrulline coverage and stronger formulation depth make it a better quality-focused match.
79 Budget

L-Arginine + L-Citrulline 750 mg

Nutricost
A large supply of clearly separated L-arginine and L-citrulline provides economical but basic nitric-oxide support. Both amounts are too low for targeted performance use without taking multiple capsules. Compared with the original, its lower serving cost improves affordability while retaining Arginine and Citrulline support.
78 Budget

L-Arginine L-Citrulline Complex 1000 mg

Best Naturals
L-arginine hydrochloride and free-form citrulline provide a focused combination with good supply economy. The arginine amount is only moderate and the citrulline amount is far below targeted performance use. Compared with the original, its lower serving cost improves affordability while retaining Arginine and Citrulline support.
78 Budget

L-Arginine L-Citrulline Complex

Source Naturals
A large supply of focused arginine and citrulline offers reasonable routine value. The arginine amount is modest, the citrulline amount is far below targeted use, and arginine may add to blood-pressure-lowering medicines. Compared with the original, its lower serving cost improves affordability while retaining Arginine and Citrulline support.
73 Value

Wellness ImmuNitric

Source Naturals
A substantial arginine amount with modest citrulline and B-vitamin support creates a coherent vascular formula at reasonable value. Duplicate folate entries reduce label clarity, and the vasodilating combination may add to nitrates or blood-pressure medicines. Compared with the original, its Arginine and Citrulline coverage and balance of formula depth and serving cost provide better practical value.
80 Value

Nitric Oxide Booster

Nutricost Performance
Three arginine forms provide a moderate combined amount and clear nitric-oxide focus at favorable value. Citrulline remains underdosed, and the undisclosed citrulline-malate ratio makes its active contribution uncertain. Compared with the original, its Arginine and Citrulline coverage and balance of formula depth and serving cost provide better practical value.
73 Value

Nitri Oxide Support

Pure Encapsulations
A substantial AAKG amount and vitamin C provide a coherent exercise-circulation base. Citrulline malate is underdosed with an undisclosed ratio, while the relatively costly serving weakens value. Compared with the original, its Arginine and Citrulline coverage and balance of formula depth and serving cost provide better practical value.
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