🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 36% of ingredients have research evidence
A Label Compliance Grade

Product Label

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Label Data

20 Gram(s) Serving Size
50 Servings
Other Combinations Product Type
36% Evidence Coverage

Supplement Facts — Evidence Check

Calories
60 Calorie(s)
Total Carbohydrates
15 Gram(s) (5% DV)
10 mg (588% DV)
📊 7.7× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 10mg UL 100mg
600 mg
📊 Market median: 500.0mg (143 products)
This product: 600mg
100 mg
📊 Market median: 2000.0mg (275 products)
Median 2000.0mg This product: 100mg
L-Norvaline
100 mg
L-Ornithine
200 mg
📊 Market median: 5.0mg (298 products) 📚 701 studies (Tier A: 5, B: 123)
This product: 3mg
Yerba Mate extract
100 mg
📊 Market median: 260.0mg (249 products) 📚 156 studies (Tier A: 4, B: 61)
This product: 100mg
📊 Market median: 495.0mg (70 products)
Median 495.0mg This product: 50mg
Gymnema sylvestre extract
50 mg
📊 Market median: 300.0mg (122 products) 📚 22 studies (Tier A: 0, B: 7)
This product: 25mg
5 mg
📊 Market median: 100.0mg (283 products) 📚 142 studies (Tier A: 1, B: 64)
This product: 5mg UL 1200mg

Other Ingredients

Dextrose Fructose Natural Flavors Citric Acid natural Beet powder Malic Acid organic Stevia leaf extract

Label Claims — Verification

Nutrient
All Other
Structure/Function
All Other (100% of products) Structure/Function (91% of products) Nutrient (35% of products)

Target Groups

Adult (18 - 50 Years) Kosher Gluten Free Dairy Free

Product Information

📋 Directions for Use

Suggested use: Mix 1 scoop with 6 oz. of water or your favorite beverage. Take 1 to 3 servings daily, depending on your training intensity. Arginine Stack should be consumed on an empty stomach at least 2 hours after a meal or protein shake.

⚠️ Warnings & Precautions

Caution: For adults only.

Consult physician if pregnant/nursing, taking medication, or have a medical condition including glaucoma.

This supplement should be avoided by persons with herpes simplex unless otherwise prescribed by a physician. Do not use if you have had a myocardial infarction or have established coronary artery disease.

Consult physician if you have impaired kidney function or are taking any prescription medications that affect kidney function.

Keep out of reach of children.

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

🧪 Formulation Notes

Arginine Stack has Creatine, a well-studied sports supplement, for its ability to support lean muscle production and muscle cell fuel availability. Yerba Mate and Guarana enhance alertness, while Rhodiola supports the body’s balanced response to stress. Green Tea extract quenches the free radicals formed during intense exercise, it has also been shown to support heart health.

Steroid free

Triangle K

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.

Additional Information

NOW Sports Arginine Stack is the ultimate energy sports supplement that also supports optimal performance.

Natural color variation may occur in this product. This product is sold by weight not volume.

Store in a cool, dry, dark place after opening.

GMP Quality Assured

Mass building / energy production Pre-workout formula Supports muscle production Nitric oxide precursor

Informed-Sport.com Trusted by sport Informed-Choice.org Trusted by sport Steroid free Triangle K No aspartame No sucralose No acesulfame-K No artificial sweeteners

Product Details

UPC / SKU 7 33739 02005 5
DSLD Entry Date 2019-07-24
Product Type Other Combinations
Form Powder
Brand NOW Sports
DSLD ID 205158
Data Updated 2026-04-11

Research Evidence

45 Research Sources
52 Avg Quality Score
12 Rct
11 Systematic Review
11 Meta Analysis
11 Clinical Trial
A Nitric oxide donors (nitrates), L-arginine, or nitric oxide synthase inhibitors for acute stroke
Meta Analysis The Cochrane database of systematic reviews 2017
A Arginine supplementation for prevention of necrotising enterocolitis in preterm infants
Meta Analysis The Cochrane database of systematic reviews 2017
B Nutritional interventions for treating foot ulcers in people with diabetes
Meta Analysis The Cochrane database of systematic reviews 2020
B Nitric oxide donors (nitrates), L-arginine, or nitric oxide synthase inhibitors for acute stroke
Systematic Review The Cochrane database of systematic reviews 2002
B Arginine supplementation for prevention of necrotising enterocolitis in preterm infants
Systematic Review The Cochrane database of systematic reviews 2007
B The Effect of Amino Acids on Wound Healing: A Systematic Review and Meta-Analysis on Arginine and Glutamine
Meta Analysis Nutrients 2021
B Nitric oxide donors (nitrates), L-arginine, or nitric oxide synthase inhibitors for acute ischaemic stroke
Systematic Review The Cochrane database of systematic reviews 2000
B Dietary Supplements for Erectile Dysfunction: Analysis of Marketed Products, Systematic Review, Meta-Analysis and Rational Use
Meta Analysis Nutrients 2023
B Arginine supplementation for prevention of necrotising enterocolitis in preterm infants
Systematic Review The Cochrane database of systematic reviews 2004
B An Analysis of Popular Online Erectile Dysfunction Supplements
Systematic Review The journal of sexual medicine 2019
View all evidence for L Arginine →

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