NOW Foods Arginine Ornithine

100 capsules
NOW Foods Arginine Ornithine

NOW Arginine & Ornithine is formulated with two essential amino acids to help support an active lifestyle. Arginine plays key role in urea metabolism, a process that facilitates safe excretion of toxic ammonia by the kidneys. Ornithine, derived from arginine is used to synthesize other amino acids citrulline, glutamic acid, and proline. Arginine & Ornithine supplements help build healthy muscles.

Supplement Facts

Serving Size: 2 Capsules
Servings Per Container: 50


Amount Per Serving

% Daily Value

L-Arginine (Free-Form)

1.0g (1,000mg)


L-Ornithine (from L-Ornithine HCl)



† Daily Value not established.

Other Ingredients: Gelatin (capsule) and magnesium stearate (vegetable source).

Suggested Use

Take 2 capsules 2 to 3 times daily, preferably with juice or water on an empty stomach, before exercise or at bedtime.


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.


  • Arginine & Ornithine supports muscle strength by promoting new muscle formation. These two amino acids stimulate the synthesis of creatine, a substance naturally found in the muscles. Studies suggest that arginine ornithine combination helps with healthy production of insulin and growth hormone. These two important hormones are needed in building muscles and maintenance of muscle strength especially during intensive exercise and training.
  • Arginine & Ornithine can help maintain muscle integrity even during old age. The elderly, who are mostly suffering from decreased energy often, lose muscle tone. Arginine & ornithine supplements support their muscles, keeping them healthy for optimum mobility.
  • Experts suggest that arginine encourages vasodilation. Arginine is concerted into Nitric oxide, a compound that relaxes the blood vessels and increases its lumen for increased blood flow. Vasodilation  can help relieve atherosclerosis, high blood pressure, intermittent claudication, erectile dysfunction, and impotence.
  • Arginine & Ornithine promote healthy cardiovascular functions in patients suffering from Congestive Heart Failure (CHF). It is thought to work with Angiotensin Converting Enzyme (ACE) Inhibitors to eliminate extra fluid in in the heart. The signs and symptoms of CHF like shortness of breath, increased urination, and difficulty sleeping when lying down are caused by the excessive fluid, preventing the heart from pumping oxygen-rich blood to the rest of the body.

Now Foods Arginine & Ornithine combines two beneficial amino acids in one health supplement. Arginine is an essential amino acid derived from foods like meats, seafood, nuts, grains, pumpkin seed, sesame seeds, and oatmeal. The body does not produce its own arginine so it greatly relies on these dietary sources of arginine. On the other hand, Ornithine is one of the non-essential amino acids, derived from arginine and the enzyme arginase. Ornithine is needed to produce other amino acids like glutamic acid, proline, and citrulline.
Together, Arginine & Orginine can do a great deal of work in keeping the body healthy and active. These two “building blocks of protein” are essential in the urea metabolism, a process that encourages safe excretion of the toxic ammonia via the kidneys. This mechanism significantly helps with healthy detoxification for overall health. Arginine plus ornithine also encourages healthy production of creatine, a substance naturally present in the muscles that increases muscle strength and stimulate formation of lean muscle mass.