NOW Sports Arginine Citrulline

120 capsules
Now Foods Arginine Citrulline, Amino acid, Now Sports, muscle growth, protein, keto, metabolism

Arginine & Citrulline combines two powerful amino acids involved in the metabolism and use of protein in the body. Arginine and Citrulline are key players in the urea cycle, where they are converted to urea to facilitate detoxification of ammonia. Arginine and Citrulline supplements maintain healthy muscles, liver tissues, circulation, and sexual behaviour via nitric oxide production.

This product is tested and certified by Informed-Choice. NOW® Sports guarantees purity with Informed-Choice Certification. Informed-Choice is an adulteration monitoring program through LGC that conducts monthly blind batch testing of registered products at the retail level and posts updated results on their website. The Informed-Choice logo indicates that these products have been tested for, and certified to be free of, banned substances through the Informed-Choice certification program.

Supplement Facts

Serving Size: 1 Capsule
Servings Per Container: 120


Amount Per Serving

% Daily Value

L-Arginine (Free-Form)

500 mg


L-Citrulline (Free-Form)

250 mg


† Daily Value not established.

Other Ingredients: Cellulose (capsule), silica, stearic acid (vegetable source), magnesium stearate (vegetable source) and cellulose powder.

Suggested Use

Take 1 capsule 3 times daily.


For adults only. Consult Doctor before use if pregnant/ nursing, taking medication (especially hypertensives, nitrates or other heart medications) or have a medical condition.


Arginine and Citrulline are important for protein metabolism and consumption that benefits the muscles, joint, hair, and nails. These two amino acids can also be converted to nitric oxide, a substance that allows maximum dilation of blood vessels for maximum blood flow. By keeping healthy nitric oxide levels, Arginine and Citrulline supplements regulate normal blood pressure level, maximum blood supply to the heart, brain, kidneys, and other vital organs. They also prevent additional stress to the heart muscles from excessive pumping of blood as a result of low nitric oxide levels. It also provides the amount of blood needed by the penis to sustain erections during sexual intercourse. For the blood vessels, L-arginine and L-citrulline helps maintain blood vessel health by preventing them from narrowing and inhibiting formation of cholesterol plaques. The L-arginine and L-citrulline complex is also beneficial for effective liver detoxification, specifically urea production and ammonia excretion. Other citrulline and arginine benefits include promoting stamina and healthy energy levels.

Now Foods combines the two powerful amino acids arginine and citrulline in one supplement to support protein metabolism, muscular health, liver detoxification, cardiovascular health, sexual performance, and stamina. Arginine or L-arginine is a semi-essential amino acid, one that the body manufactures on its own but in some circumstances need supplementation. Arginine is found in the skin in large concentrations to maintain its integrity and also in other connective tissues, especially the muscles. L-citrulline or simply citrulline is another powerful amino acid that relates well to arginine. Like arginine, citrulline is also semi-essential since the body manufactures it from other nutrients. In cases when the body manufactures less citrulline, it can also be found in food sources like watermelon, cantaloupe, and cucumbers. In the body, the L-argine and L-citrulline complex works by maintaining healthy production of Nitric Oxide (NO). Nitric Oxide is a chemical produced in the endothelial lining of the blood vessels from Arginine. NO maintains blood vessel health and allows for maximum blood flow to all organs, including the muscles, brain, liver, penis, and especially the heart. Lack of exercise, obesity, high cholesterol levels, fluctuating blood pressure, smoking, and high levels of homocysteine all lead to endothelial damage. A damaged endothelium produces inadequate Nitric Oxide production. When there are low Nitric oxide levels, the heart does extra work on pumping blood to supply the organs that need it. Citrulline is converted to arginine in the body, and arginine is then converted to Nitric oxide.