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Now Foods, Sports, L-Arginine Powder, 1 lb (454 g)

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In Stock
  • Expiration Date: Jul 2019
  • Shipping Weight: 1.42 lbs (0.64 kg)
  • Product Code: NOW-00210
  • UPC Code: 733739002105
  • Package Quantity: 1 lb (454 g)
  • Dimensions: 6.6 x 3.6 x 3.6 in, 1.2 lbs (0.54 kg)
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Product Overview


  • 100% Pure - Free-Form
  • Pharmaceutical Grade
  • A Dietary Supplement
  • GMP-Quality Assured

NOW L-Arginine is Pharmaceutical Grade.

L-Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion, as well as DNA synthesis.

Suggested Use

As a dietary supplement, take 2 level teaspoons (4.6 g) daily as needed in juice or water, preferably on an empty stomach. Consider taking these product other NOW products: L-Citrulline, P-5-P and AAKG.

Other Ingredients


Contains no sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, egg, shellfish or preservatives.


This product is sold by weight not volume.

Store in a cool, dry place.

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.

Supplement Facts
Serving Size: 2 Level Teaspoons (4.6 g)
Servings Per Container: 98
  Amount Per Serving % Daily Value
L-Arginine (Free-Form) 4.6 g (4,600 mg) *
*Daily Value not established.
iHerb Customer Reviews


Posted by 4685594338256551493 on Aug 26, 2016

Poor. Ineffective. Useless. Waste of money. Waste of time. Don't bother.

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Taste awful

Posted by 5124205420642478582 on Jul 13, 2016

Its bitter and have a fishy smell, its too hard to drink just with water, will try again with juice tomorrow.

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Very good quality.

Posted by 5682787750457333279 on Jun 26, 2016

I have used this for a long time, and i am pleased. I can recommend.

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4g Arginine + 1g Citrulline

Posted by 5106526984906807055 on Jun 24, 2016

Luis Ignarro, who discoverd the Nitric Oxide process, suggest to take maxium 6g Arginine a day wiht 1/4 citrulline better on a empty stomach. I noticed wonderfull results on my alertness, libido and muscle consistency. I take every day.

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Does what it's suppose to do

Posted by Prevaileth on Dec 19, 2015

In terms of amino acids, I think they're all generally produced to the same standards, unlike say, some green foods which can be contaminated with environmental pollutants etc. I could be wrong though, but I guess we shouldn't be too worried about purity and efficacy as much when it comes to amino's since they're synthetically produced, as opposed to things grown naturally outdoors with varying uncontrollable factors. [<-- opinion] The product alleviates chest pains when working out [by it's N.O mechanism], along with a plethora of other supplements to help. But this one nailed it when the others no longer seemed to be as effective after consecutive days of workouts. For those giving this product a one star purely for the taste: this isn't a taste testing competition. Just because it tastes bad doesn't mean it's a bad product. A one star to me is a product that doesn't work at all, this one does. If I wanted to know the taste I'd ask a supplement connoisseur. I find a half a cup of cordial mixed with water with this helps mask the disgusting, thickening and sickening bitter taste. You need something really sweet to counteract and balance it out. A chaser of juice or something pleasant afterwards also gets rid of the aftertaste. Review 2: Taking double the recommended dose has boosted my mood quite considerably and given me clearer vision to boot. Also, some may be taking this to encourage GH production, in that case it should be taken on an empty stomach and with no sugar as sugar inhibits GH production [from my basic understanding], but I cannot simply muster up to the taste for this. Anecdotally, I find Ornithine before bed works well even with food and sugar, results being more defined muscles, better recovery, and clearer and more youthful looking skin.

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