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NOW Sports, Arginine & Citrulline 500 mg/ 250 mg, Amino Acids, 120 Veg Capsules

4.3 out of 5 stars 639 ratings
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Purchase options and add-ons

Brand NOW
Flavour Unflavored
Primary supplement type arginine
Unit count 120 Count
Item form Capsule
Item weight 0.05 Kilograms
Item dimensions L x W x H 8 x 4 x 6 Centimetres
Product benefits Detox,Metabolism
Age range (description) Adult
Package information Bottle

About this item

  • NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics
  • PROTEIN METABOLISM*: Arginine and citrulline are two amino acids that are integral to protein metabolism and utilization, as well as to the maintenance of muscle tissue*
  • NITRIC OXIDE PRECUSOR*/PRE-WORKOUT SUPPLEMENT: Take one capsule up to twice a day, preferably before working out.
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation)
  • FAMILY OWNED & OPERATED: Our product is proudly packaged by a family owned and operated company since 1968.
› See more product details

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Important information

Safety Information

Consult a health care practitioner prior to use if you are pregnant or breastfeeding, if your cardiovascular condition worsens, if you have a renal/kidney disease or if you are following a low protein diet. Consult a health care practitioner prior to use if you suffer from a cardiovascular disease and are attempting an increase in physical activity. Consult a health care practitioner prior to use if you are taking medication for cardiovascular diseases, erectile dysfunction, and/or blood thinners. Do not use if you have had a heart attack/myocardial infarction. Some people may experience gastro-intestinal discomfort (such as diarrhea).

Ingredients

Each capsule contains: L-Arginine 500 mg, L-Citrulline 250 mg. Non-Medicinal Ingredients: Veg Capsule (hypromellose, water), Silica, Stearic Acid (vegetable source), Magnesium Stearate (vegetable source), Cellulose.

Directions

Adult Dosage: Take 2 Capsule, 1-3 times daily between meals. Consult a health care practitioner for use beyond 6 weeks.

Legal Disclaimer

Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product.

Product description

Arginine and Citrulline are two amino acids that are integral to protein metabolism and utilization, as well as to the maintenance of muscle tissue. Both are key intermediates in the urea cycle, where they participate in the detoxification of ammonia via the production of urea. Arginine that has not been converted to urea, enters general circulation where it is distributed to various tissues and metabolized for other uses such as protein synthesis.Scientific studies have shown that supplementing Citrulline along with Arginine helps maintain nitrogen balance better than supplementation with Arginine alone. Our NOW® natural and organic Supplements are an effective way to ensure you and your loved ones are getting essential vitamins, minerals and nutrients for daily optimal health. Since 1968, NOW®has been making top quality products that are tested to the highest standards to empower people to lead healthier lives. Our promise - what is on the label, is precisely what is in the bottle.

From the brand

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  4. Certified Informed Sport

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From the manufacturer

sports nutrition active work out
pre work out essentials
training essentials
post work out essentials
support your fitness goals NOW

Product information

Technical Details

Manufacturer ‎NOW
Place of Business ‎NOW Canada Health Group, 5068 Whitelaw Road, RR6 Guelph, ON N1H 6J3
Item model number ‎NOW Arginine & Citrulline 120vcap
Product Dimensions ‎8 x 4 x 6 cm; 50 g
ASIN ‎B078WTFRNS

Additional Information

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NOW Sports, Arginine & Citrulline 500 mg/ 250 mg, Amino Acids, 120 Veg Capsules

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Product details

  • Product Dimensions ‏ : ‎ 8 x 4 x 6 cm; 50 g
  • Date First Available ‏ : ‎ Jan. 1 2018
  • Manufacturer ‏ : ‎ NOW
  • Place of Business ‏ : ‎ NOW Canada Health Group, 5068 Whitelaw Road, RR6 Guelph, ON N1H 6J3
  • ASIN ‏ : ‎ B078WTFRNS
  • Item model number ‏ : ‎ NOW Arginine & Citrulline 120vcap
  • Country of origin ‏ : ‎ USA
  • Customer Reviews:
    4.3 out of 5 stars 639 ratings

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Customer reviews

4.3 out of 5 stars
639 global ratings

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Customers say

Customers like the effectiveness, energy, and cardiovascular effects of the nutritional supplement. They mention it seems to be fine, gives them energy, and reduces their blood pressure naturally. Customers also say the product is easy to swallow and digest.

Select to learn more

EffectivenessEnergyCardiovascular effectsPumpEase of use
45 customers mention "Effectiveness"45 positive0 negative

Customers are satisfied with the effectiveness of the nutritional supplement. They mention it seems to be fine, very effective, and not too strong for their stomach. Customers also say it provides more endurance, less fatigue, and more power.

"Good Product." Read more

"Not too strong for my stomach" Read more

"Anyone who works out should take this. It helps muscle growth and maintain stamina." Read more

"An excellent product. Much less work and mess than with powdered drink supplements" Read more

12 customers mention "Energy"12 positive0 negative

Customers say the product gives them energy. They mention it helps muscle growth and maintain stamina. Some say they feel less tired at the end of the day and their love muscles have never been stronger.

"...about 15 minutes before working out and we both noticed increased amounts of energy...." Read more

"Anyone who works out should take this. It helps muscle growth and maintain stamina." Read more

"...oxygen and blood to the muscles in order to get more endurance, less fatigue, and more power to lift...." Read more

"...This product is a supplement. This product provides energy in men confirmed in clinical study (1-1) this product may cause more then just a but of..." Read more

5 customers mention "Cardiovascular effects"5 positive0 negative

Customers are satisfied with the cardiovascular effects of the product. They mention it improves circulation, reduces blood pressure, and makes them more vascular at the gym.

"Taking this product 3 times per day will reduce your blood pressure by at about 20 points...." Read more

"...In addition, Arginine / Citrulline helps to control your blood pressure as long as you lead a healthy life such as better eating habits and moderate..." Read more

"...This supplement along with other supplements together has Improved my circulation and reduced my blood pressure in a natural way." Read more

"Good product quality, noticeable improvements in my cardiovascular system." Read more

4 customers mention "Pump"4 positive0 negative

Customers say the product gives them the pump they need. They mention it feels like their arms are bursting.

"...nt last as long as i hoped for but for a good 45 mins or so i had a nice pump. Nothing too crazy. I may try other products to compare." Read more

"Get so pumped, it felt like my arms were bursting... Best feeling ever. Also great for putting on size. Also great for just looking impressive...." Read more

"...I take two about hr before gym and my pumps are unreal. Great product." Read more

"Gives that pump you need..." Read more

3 customers mention "Ease of use"3 positive0 negative

Customers like the ease of use of the nutritional supplement. They mention it's easy to swallow and only citrulline is easier to digest.

"...better lately; but, can I attribute it to this? They are easy to swallow and I believe the ingredients will contribute to the quality of my..." Read more

"...I've stop using for that reason. Only Citrulline is easier to digest." Read more

"Easy to swallow..." Read more

Expired and broken pills
1 out of 5 stars
Expired and broken pills
Product contained broken capsule(s) which coated inside with white powdery residue. Additionally, the product delivered is more than two years expired @ 07/2021.
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Top reviews from Canada

  • Doc Ali
    5.0 out of 5 stars As advertised.
    Reviewed in Canada on May 23, 2025
    Verified Purchase
    Good Product.
    Helpful
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  • Tudval
    4.0 out of 5 stars It's arginine+citruline
    Reviewed in Canada on October 5, 2023
    Verified Purchase
    Seems to be working for me after only a few days taking 4 capsules per day. But the capsules are pretty big, so most of the time I will open them and mix in yogourt or a shake. One review is questioning the expiry date. It's barely legible, so I had to take a picture and blow it up to be able to read it, but the year is 2027, even as at first it may appeared to be 2021 with the naked eye.
    Helpful
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  • Terry Tae Hyun Kim
    5.0 out of 5 stars Good for health
    Reviewed in Canada on April 9, 2025
    Verified Purchase
    Not too strong for my stomach
    Helpful
     Report
  • T.T.
    5.0 out of 5 stars Great for extra energy!
    Reviewed in Canada on November 9, 2024
    Verified Purchase
    If taken before a workout, it will provide you with extra energy. My husband and I both took two capsules about 15 minutes before working out and we both noticed increased amounts of energy. We’re both in our early 50s and extra energy is definitely needed for workouts. I did have reduce my intake to one capsule with food prior to a workout because two capsules were causing me to have heartburn. Which is very unusual because I have never experienced heartburn before, was the first time for me after taking 2 capsules at a time. My husband experienced no issues with heartburn at all. We have gone through about three bottles of this product in total between the two of us.
    2 people found this helpful
    Helpful
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  • michal krisa
    3.0 out of 5 stars Not Worth It …
    Reviewed in Canada on March 6, 2023
    Verified Purchase
    I read the reviews and was intrigued because as someone over 60 year of age, that weight trains regularly, why wouldn’t want more energy? The recommended dosage is 6/day but I have only been doing 4/day. I can’t see any measurable improvement in performance to warrant continued use :(
    Customer image
    michal krisa
    3.0 out of 5 stars
    Not Worth It …

    Reviewed in Canada on March 6, 2023
    I read the reviews and was intrigued because as someone over 60 year of age, that weight trains regularly, why wouldn’t want more energy? The recommended dosage is 6/day but I have only been doing 4/day. I can’t see any measurable improvement in performance to warrant continued use :(
    Images in this review
    Customer image
    6 people found this helpful
    Helpful
     Report
  • Glen
    5.0 out of 5 stars great combo for life extension
    Reviewed in Canada on December 17, 2024
    Verified Purchase
    will buy again
    Helpful
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  • John
    4.0 out of 5 stars It works but one should consult doctor before
    Reviewed in Canada on May 27, 2024
    Verified Purchase
    Surprisingly it worked within a week but some side effects too,stomach’s uncomfortable
    Helpful
     Report
  • Splatter
    5.0 out of 5 stars Seems to be fine.
    Reviewed in Canada on July 3, 2024
    Verified Purchase
    How does one evaluate the effectiveness? I think I feel a bit better lately; but, can I attribute it to this?
    They are easy to swallow and I believe the ingredients will contribute to the quality of my life.
    One person found this helpful
    Helpful
     Report

Disclaimer:While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read and follow labels, warnings, and directions before using or consuming a product. This product may not be right for you. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. 鶹.ca assumes no liability for inaccuracies or misstatements about products.