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Now Foods, L-Arginine, 500 mg, 250 Capsules

By Now Foods

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  • Product Code: NOW-00031
  • UPC Code: 733739000316
  • Package Quantity: 250 Capsules
  • Dimensions: 5.3 x 3 x 3 in, 0.45 lbs (0.2 kg)
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Product Overview

  • Non-GMO
  • A Dietary Supplement
  • Amino Acids
  • Family Owned Since 1968
  • GMP Quality Assured

Amino Acid

  • Conditionally Essential Amino Acid
  • Nitric Oxide Precursor

L-Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion, as well as DNA synthesis and protein production. It is an important precursor of Nitric Oxide (NO) and thus plays a role in the dilation of blood vessels.

Suggested Use

Take 2 capsules twice daily as needed. Take between meals or at bedtime with a carbohydrate drink to facilitate absorption.

Other Ingredients

Gelatin (capsule), magnesium stearate (vegetable source) and silica.

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.

The L-Arginine used in this product is Pharmaceutical Grade.

Natural color variation may occur in this product.


Store in a cool, dry place after opening.

Please recycle.

Caution: For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition. This supplement should be avoided by persons with glaucoma or herpes simplex unless otherwise prescribed by a physician. Do not use if you have had a myocardial infarction or have established coronary artery disease. Keep out of reach of children.

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Supplement Facts
Serving Size: 2 Capsules
Servings Per Container: 125
  Amount Per Serving % Daily Value
L-Arginine (Free-Form) 1 g (1,000 mg) *
* Daily Value not established.

iHerb Customer Reviews

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Posted by Reviewer1873524 on Jun 24, 2010

Good product. Make sure you supplement with Lysine also. This product made me feel great until my lysine stores were depleted then I felt hugely tired. Started taking lysine then I felt great again.

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24 people found the following review helpful

Great Energy

Posted by Reviewer3319381 on Feb 21, 2011

I read an article that said if you try L-Arginine and you don't feel anything, you don't need it. But if you do feel something, you will need it for the rest of your life. I take this and my energy is through the roof. Great product and helps you burn fat also. Highly recommend.

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20 people found the following review helpful

Works for high blood pressure

Posted by Reviewer2786187 on Dec 15, 2011

L-Arginine definitely works to normalize elevated blood pressure for me, and it works almost immediately. My pressure was about 158 over 90 constantly. Within an hour after taking L-Arginine at about 2,000 mg, the pressure was normalized to about 120 over 80. That was true whether I took it myself or if it were taken elsewhere. Reportedly, it is best taken at bed time to prevent narrowing and hardening of the arteries caused by inactivity during the night. I usually take 2,000 mg on an empty stomach in the morning and the same amount before bed.

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18 people found the following review helpful

Drops Blood Pressure!

Posted by Reviewer2737548 on Sep 12, 2010

Heard that this would lower blood pressure by 20 points using 2,000 mg per day, in just 2 weeks. I tried it and it worked, even more than 20 points!

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14 people found the following review helpful

Best Bang for the Buck!

Posted by Reviewer1375664 on May 08, 2010

Don't get me wrong...you will need to take about 4-5grams a serving to FEEL it. Morning,Before a workout and Just before bed. You will actually feel more pumped up due to the Nitric Oxide increase. Your Libido will feel leveled up. You will actually feel something with this product. It is clinically proven. NOW has easy swallow tabs.Great Price.

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14 people found the following review helpful

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