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500/250 100 capsules: Now
Item# 01039

Retail Price: $17.99

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  • Arginine/Ornithine
  • 500/250 100 capsules: Now
  • Item Catalog Number: 01039

L-arginine is a semi-essential amino acid involved in numerous areas of human biochemistry, including ammonia detoxification, hormone secretion, and immune modulation. Arginine is also well known as a precursor to nitric oxide (NO), a key component of endothelial-derived relaxing factor, an endogenous messenger molecule involved in a variety of endothelium-dependent physiological effects in the cardiovascular system.94,95

L-ornithine is a metabolite of arginine in the body, formed as a byproduct of the action of the arginase enzyme on arginine.96,97 L-arginine is required for the body to synthesize nitric oxide,98,99 which enables the arterial system to retain its youthful elasticity. Nitric oxide also helps to produce an endothelial-derived relaxing factor, which is needed by the arterial system to expand and contract with each heartbeat.100-109

L-arginine may also help maintain the health of the immune system.110-114

L-arginine is a key building block to maintaining healthy tissue and bone. L-ornithine may also be used for this purpose.115-125

This product from NOW® Sports combines two essential amino acids into one optimal supplement that is ideal for active individuals.



Supplement Facts

Serving Size 2 capsules

Servings Per Container 50

Amount Per Serving

L-Arginine (Free-Form)

1 g

L-Ornithine (from L-Ornithine HCl)

500 mg

Other ingredients: gelatin (capsule) and magnesium stearate (vegetable source).

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


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.

Dosage and Use
  • As a dietary supplement, take 2 capsules 2 to 3 times daily, preferably with juice or water on an empty stomach, before exercise or at bedtime.