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GNC Pro Performance® L-Arginine L-Ornithine 2500

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Description
Dietary Supplement
  • 1500mg of L-Arginine & 1000mg of L-Ornithine
  • Fuels Muscles & N.O. Production
  • Helps Support Blood Vessel Tone
Pro Performance L-Arginine & L-Ornithine are two amino acids popular among serious athlethes, bodybuilders & fitness enthusiasts. L-Arginine supports blood vessel tone and boosts nitric oxide.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Supplement Facts

As a dietary supplement, take four tablets daily.

Serving Size 4 Tablets
Servings Per Container 15
Amount Per Serving % DV
L-Arginine 1500.00 mg **
L-Ornithine (as L-Ornithine Monohydrochloride) 1000.00 mg **
** Daily Value (DV) not established

Other Ingredients: Cellulose, Dicalcium Phosphate

No Sugar, No Starch, No Artificial Color, No Artificial Flavors, No Preservatives, No Corn, No Wheat, No Gluten, No Soy, No Dairy, Yeast Free

Storage Instructions: Store in a cool dry place.

Warning: Keep out of reach of children

Consult your physician prior to using this product if you are pregnant, nursing, taking medication, or have a medical condition.

Distributed by: General Nutrition Corporation, Pittsburgh, PA 15222

Health Notes

Arginine

Arginine
This nutrient has been used in connection with the following health goals
  • Reliable and relatively consistent scientific data showing a substantial health benefit.
  • Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
  • For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.

Our proprietary "Star-Rating" system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by the medical community, and whether studies have found them to be effective for other people.

For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.

This supplement has been used in connection with the following health conditions:

Angina
Dose: 2 to 3 grams three times per day
In one study, taking arginine improved the ability of angina sufferers to exercise. Detailed studies have proven that arginine works by stimulating blood vessel dilation.(more)
Congestive Heart Failure
Dose: 5.6 to 15 grams per day with a doctor's supervision
The body needs arginine to make nitric oxide, which increases blood flow. This process is impaired in people with CHF. It also has been shown to improve kidney function in people with CHF.(more)
Hypertension
Dose: Refer to label instructions
The amino acid arginine is needed by the body to make nitric oxide, a substance that allows blood vessels to dilate, thus reducing blood pressure. Arginine given orally and intravenously has been reported to help reduce blood pressure.(more)
Erectile Dysfunction
Dose: 1,670 to 2,800 mg daily
Blood vessels need arginine to dilate and form an erection. Supplementing with arginine has been shown to help men with erectile dysfunction in some studies.(more)
Male Infertility
Dose: 4 grams daily
The amino acid arginine is needed to produce sperm. Research shows that several months of L-arginine supplementation increases sperm count, quality, and fertility.(more)
Male Infertility
Dose: Refer to label instructions
(more)
Erectile Dysfunction
Dose: 1,670 to 2,800 mg daily
Blood vessels need arginine to dilate and form an erection. Supplementing with arginine has been shown to help men with erectile dysfunction in some studies.(more)
Pre- and Post-Surgery Health
Dose: 12.5 to 18.75 grams daily before and after surgery
The amino acid arginine has a role in immune function, infection prevention, and tissue repair after injury, including surgery.(more)
HIV and AIDS Support and Preservation of Lean Body Mass
Dose: 1.5 grams of HMB, 7 grams of L-glutamine, and 7 grams of L-arginine twice per day
The combination of glutamine, arginine, and HMB may prevent loss of lean body mass in people with AIDS-associated wasting.(more)
Gastritis
Dose: Refer to label instructions
The amino acid arginine may both protect the stomach and increase its blood flow.(more)
Wound Healing
Dose: Refer to label instructions
Arginine appears to improve wound healing by increasing protein synthesis.(more)
Wound Healing
Dose: Refer to label instructions
Arginine appears to improve wound healing by increasing protein synthesis.(more)
Athletic Performance and Body Composition and Strength
Dose: Refer to label instructions
At very high intakes, the amino acid arginine has increased growth hormone levels, which stimulate muscle growth. Trials combining weight training with arginine and ornithine showed decreases in body fat and increases in total strength and lean body mass.(more)
Female Infertility and In Vitro Fertilization
Dose: Refer to label instructions
Supplementing with L-arginine has been shown to improve fertility in women with a history of failed attempts at in vitro fertilization.(more)
Interstitial Cystitis
Dose: Refer to label instructions
(more)
Angina
Dose: 2 to 3 grams three times per day

Nitroglycerin and similar drugs cause dilation of arteries by interacting with nitric oxide, a potent stimulus for dilation. Nitric oxide is made from arginine, a common amino acid. Blood cells in people with angina are known to make insufficient nitric oxide,1 which may in part be due to abnormalities of arginine metabolism. Taking 2 grams of arginine three times per day for as little as three days has improved the ability of angina sufferers to exercise.2 Seven of ten people with severe angina improved dramatically after taking 9 grams of arginine per day for three months in an uncontrolled study.3 Detailed studies have investigated the mechanism of arginine and have proven it operates by stimulating blood vessel dilation.4

References

1. Mollace V, Romeo F, Martuscelli E, et al. Low formation of nitric oxide in polymorphonuclear cells in unstable angina pectoris. Am J Cardiol 1994;74:65-8.

2. Ceremuzynski L, Chamiec T, Herbaczynska-Cedro K. Effect of supplemental oral L-arginine on exercise capacity in patients with stable angina pectoris. Am J Cardiol 1997;80:331-3.

3. Blum A, Porat R, Rosenschein U, et al. Clinical and inflammatory effects of dietary L-arginine in patients with intractable angina pectoris. Am J Cardiol 1999;83:1488-90.

4. Egashira K, Hirooka Y, Kuga T, et al. Effects of L-arginine supplementation on endothelium-dependent coronary vasodilation in patients with angina pectoris and normal coronary arteriograms. Circulation 1996;94:130-4.

Congestive Heart Failure
Dose: 5.6 to 15 grams per day with a doctor's supervision

The body needs arginine, another amino acid, to make nitric oxide, which increases blood flow. This process is impaired in people with CHF. Arginine supplementation (5.6-12.6 grams per day) has been used successfully in double-blind trials to treat CHF.1A double-blind trial has also found that arginine supplementation (5 grams three times daily) improves kidney function in people with CHF.2

References

1. Rector TS, Bank A, Mullen KA, et al. Randomized, double-blind, placebo controlled study of supplemental oral L-arginine in patients with heart failure. Circulation 1996;93:2135-41.

2. Watanabe G, Tomiyama H, Doba N. Effects of oral administration of L-arginine on renal function in patients with heart failure. J Hypertens 2000;18:229-34.

Hypertension
Dose: Refer to label instructions

The amino acid arginine is needed by the body to make nitric oxide, a substance that allows blood vessels to dilate, thus leading to reduced blood pressure. Intravenous administration of arginine has reduced blood pressure in humans in some reports.1 In one controlled trial, people not responding to conventional medication for their hypertension were found to respond to a combination of conventional medication and oral arginine (2 grams taken three times per day.)2

References

1. Calver A, Collier J, Vallance P. Dilator actions of arginine in human peripheral vasculature. Clin Sci 1991;81:695-700.

2. Pezza V, Bernardini F, Pezza E, et al. Study of supplemental oral l-arginine in hypertensives treated with enalapril + hydrochlorothiazide. Am J Hypertens 1998;11:1267-70 [letter].

Erectile Dysfunction
Dose: 1,670 to 2,800 mg daily

Dilation of blood vessels necessary for a normal erection depends on a substance called nitric oxide, and nitric oxide formation depends on the amino acid arginine. In a preliminary trial, men with ED were given 2,800 mg of arginine per day for two weeks. Six of the 15 men in the trial were helped, though none improved while taking placebo.1 In a larger double-blind trial, men with ED were given 1,670 mg of arginine per day or a matching placebo for six weeks.2 Arginine supplementation was found to be particularly effective at improving ED in men with abnormal nitric oxide metabolism. Although little is known about how effective arginine will be for men with ED or which subset of these men would be helped, available research looks promising and suggests that at least some men are likely to benefit.

References

1. Zorgniotti AW, Lizza EF. Effect of large doses of the nitric oxide precursor, L-arginine, on erectile dysfunction. Int J Impot Res 1994;6:33-6.

2. Chen J, Wollman Y, Chernichovsky T, et al. Effect of oral administration of high-dose nitric oxide donor L-arginine in men with organic erectile dysfunction: results of a double-blind, randomized study. BJU Int 1999;83:269-73.

Male Infertility
Dose: 4 grams daily

Arginine, an amino acid found in many foods, is needed to produce sperm. Research, most of which is preliminary shows that several months of L-arginine supplementation increases sperm count, quality,1, 2, 3 and fertility.4, 5 However, when the initial sperm count was extremely low (such as less than 10 million per ml), L-arginine supplementation produced little or no benefit.6, 7 While some pregnancies have been attributed to arginine supplementation in preliminary reports,8 no controlled research has confirmed these claims. For infertile men with sperm counts greater than 10 million per milliliter, many doctors recommend up to 4 grams of L-arginine per day for several months.

References

1. De Aloysio D, Mantuano R, Mauloni M, Nicoletti G. The clinical use of arginine aspartate in male infertility. Acta Eur Fertil 1982;13:133-67.

2. Tanimura J. Studies on arginine in human semen. Part II. The effects of medication with L-arginine-HCl on male infertility. Bull Osaka Med School 1967;13:84-9.

3. Scibona M, Meschini P, Capparelli S, et al. L-arginine and male infertility. Minerva Urol Nefrol 1994;46:251-3.

4. Schacter A, Goldman JA, Zukerman Z. Treatment of oligospermia with the amino acid arginine. J Urol 1973;110:311-3.

5. Schacter A, Friedman S, Goldman JA, Eckerling B. Treatment of oligospermia with the amino acid arginine. Int J Gynaecol Obstet 1973;11:206-9.

6. Mroueh A. Effect of arginine on oligospermia. Fertil Steril 1970:21:217-9.

7. Pryor JP, Blandy JP, Evans P, et al. Controlled clinical trial of arginine for infertile men with oligozoospermia. Br J Urol 1978;50:47-50.

8. Aydin S, Inci O, Alagol B. The role of arginine, indomethacin and kallikrein in the treatment of oligoasthenospermia. Int Urol Nephrol 1995;27:199-202.

Male Infertility
Dose: Refer to label instructions
Erectile Dysfunction
Dose: 1,670 to 2,800 mg daily

Dilation of blood vessels necessary for a normal erection depends on a substance called nitric oxide, and nitric oxide formation depends on the amino acid arginine. In a preliminary trial, men with ED were given 2,800 mg of arginine per day for two weeks. Six of the 15 men in the trial were helped, though none improved while taking placebo.1 In a larger double-blind trial, men with ED were given 1,670 mg of arginine per day or a matching placebo for six weeks.2 Arginine supplementation was found to be particularly effective at improving ED in men with abnormal nitric oxide metabolism. Although little is known about how effective arginine will be for men with ED or which subset of these men would be helped, available research looks promising and suggests that at least some men are likely to benefit.

References

1. Zorgniotti AW, Lizza EF. Effect of large doses of the nitric oxide precursor, L-arginine, on erectile dysfunction. Int J Impot Res 1994;6:33-6.

2. Chen J, Wollman Y, Chernichovsky T, et al. Effect of oral administration of high-dose nitric oxide donor L-arginine in men with organic erectile dysfunction: results of a double-blind, randomized study. BJU Int 1999;83:269-73.

Pre- and Post-Surgery Health
Dose: 12.5 to 18.75 grams daily before and after surgery

The amino acid arginine has a role in immune function, infection prevention, and tissue repair after injury, including surgery.1 Animal research suggests that supplemental arginine may improve the outcomes in cardiovascular2 and colon surgeries.3 Other animal studies suggest a possible role for arginine in prevention of adhesions, a painful type of internal scarring that can occur with surgery.4 Human trials of formulas including arginine are discussed below, but the benefits of supplemental arginine alone have not been studied in surgery patients.

References

1. Evoy D, Lieberman MD, Fahey TJ 3rd, Daly JM. Immunonutrition: the role of arginine. Nutrition 1998;14:611-7 [review].

2. Szabo G, Bahrle S, Batkai S, et al. L-arginine: effect on reperfusion injury after heart transplantation. World J Surg 1998;22:791-7.

3. Shashidharan M, Lin KM, Ternent CA, et al. Influence of arginine dietary supplementation on healing colonic anastomosis in the rat. Dis Colon Rectum 1999;42:1613-7.

4. Kaleli B, Ozden A, Aybek Z, Bostanci B. The effect of L-arginine and pentoxifylline on postoperative adhesion formation. Acta Obstet Gynecol Scand 1998;77:377-80.

HIV and AIDS Support and Preservation of Lean Body Mass
Dose: 1.5 grams of HMB, 7 grams of L-glutamine, and 7 grams of L-arginine twice per day

The combination of glutamine, arginine, and the amino acid derivative, hydroxymethylbutyrate (HMB), may prevent loss of lean body mass in people with AIDS-associated wasting. In a double-blind trial, AIDS patients who had lost 5% of their body weight in the previous three months received either placebo or a nutrient mixture containing 1.5 grams of HMB, 7 grams of L-glutamine, and 7 grams of L-arginine twice daily for eight weeks.1 Those supplemented with placebo gained an average of 0.37 pounds, mostly fat, but lost lean body mass. Those taking the nutrient mixture gained an average of 3 pounds, 85% of which was lean body weight.

References

1. Clark RH, Feleke G, Din M, et al. Nutritional treatment for acquired immunodeficiency virus-associated wasting using beta-hydroxy beta-methylbutyrate, glutamine, and arginine: a randomized, double-blind, placebo-controlled study. JPEN J Parenter Enteral Nutr 2000;24:133-9.

Gastritis
Dose: Refer to label instructions

Various amino acids have shown promise for people with gastritis. In a double-blind trial, taking 200 mg of cysteine four times daily provided significant benefit for people with bleeding gastritis caused by NSAIDs (such as aspirin).1 Cysteine is a sulfur-containing amino acid that stimulates healing of gastritis. In a preliminary trial, 1-4 grams per day of NAC (N-acetyl cysteine) given to people with atrophic gastritis for four weeks appeared to increase healing.2Glutamine, another amino acid is a main energy source for cells in the stomach and supplementation may increase blood flow to this region.3 Patients in surgical intensive care units often develop gastrointestinal problems related to a glutamine deficiency.4 When burn victims were supplemented with glutamine, they did not develop stress ulcers, even after several operations.5 Nevertheless, it remains unclear to what extent glutamine supplementation might prevent or help existing gastritis. Preliminary evidence suggests the amino acid arginine may both protect the stomach and increase its blood flow,6 but research has yet to investigate the effects of arginine supplementation in people with gastritis.

References

1. Salim AS. Sulfhydryl-containing agents in the treatment of gastric bleeding induced by non-steroidal anti-inflammatory drugs. Can J Surg 1993;36(1):53-8.

2. Farinati F, Cardin R, Della Libera G, et al. Effects of N-acetyl-L-cysteine in patients with chronic atrophic gastritis and nonulcer dyspepsia: a phase III pilot study. Curr Ther Res 1997;58:724-33.

3. Houdijk AP, Van Leeuwen PA, Boermeester MA, et al. Glutamine-enriched enteral diet increases splanchnic blood flow in the rat. Am J Physiol 1994;267(6 Pt 1):G1035-40.

4. Wilmore DW, Smith RJ, O'Dwyer ST, et al. The gut: a central organ after surgical stress. Surgery 1988;104:917-23.

5. Yan R, Sun Y, Sun R. Early enteral feeding and supplement of glutamine prevent occurrence of stress ulcer following severe thermal injury. Chung Hua Cheng Hsing Shao Shang Wai Ko Tsa Chih 1995;11(3):189-92.

6. Brzozowski T, Konturek SJ, Sliwowski Z, et al. Role of L-arginine, a substrate for nitric oxide-synthase, in gastroprotection and ulcer healing. J Gastroenterol 1997;32(4):442-52.

Wound Healing
Dose: Refer to label instructions

Arginine supplementation increases protein synthesis and improves wound healing in animals.1 Two controlled trials have shown increased tissue synthesis in surgical wounds in people given 17-25 grams of oral arginine per day.2, 3

References

1. Barbul A, Rettura G, Levenson SM, et al. Wound healing and thymotropic effects of arginine: a pituitary mechanism of action. Am J Clin Nutr 1983;37:786-94.

2. Kirk SJ, Hurson M, Regan MC, et al. Arginine stimulates wound healing and immune function in elderly human beings. Surgery 1993;114:155-60.

3. Barbul A, Lazarou SA, Efron DT, et al. Arginine enhances wound healing and lymphocyte immune responses in humans. Surgery 1990;108:331-7.

Wound Healing
Dose: Refer to label instructions

Arginine supplementation increases protein synthesis and improves wound healing in animals.1 Two controlled trials have shown increased tissue synthesis in surgical wounds in people given 17-25 grams of oral arginine per day.2, 3

References

1. Barbul A, Rettura G, Levenson SM, et al. Wound healing and thymotropic effects of arginine: a pituitary mechanism of action. Am J Clin Nutr 1983;37:786-94.

2. Kirk SJ, Hurson M, Regan MC, et al. Arginine stimulates wound healing and immune function in elderly human beings. Surgery 1993;114:155-60.

3. Barbul A, Lazarou SA, Efron DT, et al. Arginine enhances wound healing and lymphocyte immune responses in humans. Surgery 1990;108:331-7.

Athletic Performance and Body Composition and Strength
Dose: Refer to label instructions

At very high intakes (approximately 250 mg per 2.2 pounds of body weight), the amino acid arginine has increased growth hormone levels,1 an effect that has interested body builders due to the role of growth hormone in stimulating muscle growth.2 However, at lower amounts recommended by some manufacturers (5 grams taken 30 minutes before exercise), arginine failed to increase growth hormone release and may even have impaired the release of growth hormone in younger adults.3 Large quantities (170 mg per 2.2 pounds of body weight per day) of a related amino acid, ornithine, have also raised growth hormone levels in some athletes.4 High amounts of arginine or ornithine do not appear to raise levels of insulin,5, 6 another anabolic (bodybuilding) hormone. More modest amounts of a combination of these amino acids have not had measurable effects on any anabolic hormone levels during exercise.7, 8

Nonetheless, double-blind trials conducted by one group of researchers, combining weight training with either arginine and ornithine (500 mg of each, twice per day, five times per week) or placebo, found the amino-acid combination produced decreases in body fat,9 resulted in higher total strength and lean body mass, and reduced evidence of tissue breakdown after only five weeks.10

References

1. Besset A, Bonardet A, Rondouin G, et al. Increase in sleep related GH and Prl secretion after chronic arginine aspartate administration in man. Acta Endocrinol 1982;99:18-23.

2. Macintyre JG. Growth hormone and athletes. Sports Med 1987;4:129-42 [review].

3. Marcell TJ, Taaffe DR, Hawkins SA, et al. Oral arginine does not stimulate basal or augment exercise-induced GH secretion in either young or old adults. J Gerontol A Biol Sci Med Sci 1999;54:M395-9.

4. Bucci L, Hickson JF, Pivarnik JF, et al. Ornithine ingestion and growth hormone release in body-builders. Nutr Res 1990;10:239-45.

5. Gater DR, Gater DA, Uribe JM, et al. Effects of arginine/lysine supplementation and resistance training on glucose tolerance. J Appl Physiol 1992;72:1279-84.

6. Bucci LR, Hickson JF Jr, Wolinsky I, et al. Ornithine supplementation and insulin release in bodybuilders. Int J Sport Nutr 1992;2:287-91.

7. Suminski RR, Robertson RJ, Goss FL, et al. Acute effect of amino acid ingestion and resistance exercise on plasma growth hormone concentration in young men. Int J Sport Nutr 1997;7:48-60.

8. Fogelholm GM, Naveri HK, Kiilavuori KT, et al. Low-dose amino acid supplementation: no effects on serum human growth hormone and insulin in male weightlifters. Int J Sport Nutr 1993;3:290-7.

9. Elam RP. Morphological changes in adult males from resistance exercise and amino acid supplementation. J Sports Med Phys Fitness 1988;28:35-9.

10. Elam RP, Hardin DH, Sutton RA, et al. Effects of arginine and ornithine on strength, lean body mass and urinary hydroxyproline in adult males. J Sports Med Phys Fitness 1989;29:52-6.

Female Infertility and In Vitro Fertilization
Dose: Refer to label instructions

Supplementation with the amino acid, L-arginine (16 grams per day), has been shown to improve fertilization rates in women with a previous history of failed attempts at in vitro (test tube) fertilization.1

References

1. Battaglia C, Salvatori M, Maxia N, et al. Adjuvant L-arginine treatment for in-vitro fertilization in poor responder patients. Hum Reprod 1999;14:1690-7.

Interstitial Cystitis
Dose: Refer to label instructions

The amino acid arginine has several roles in the body, such as assisting in wound healing, helping remove excess ammonia from the body, stimulating immune function, and promoting secretion of several hormones, including glucagon, insulin, and growth hormone.

Copyright 2014 Aisle7. All rights reserved. Aisle7.com

The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2015.

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Ratings and Reviews

REVIEW SNAPSHOT®

by PowerReviews
GNC Pro Performance® L-Arginine L-Ornithine 2500
 
4.1

(based on 13 reviews)

100%

of respondents would recommend this to a friend.

Pros

  • Good value (10)
  • Easy to take (9)
  • Helps with fatigue (6)

Cons

    Best Uses

    • Daily use (11)
    • Pre-workout (6)
    • Post-workout (3)
      • Reviewer Profile:
      • Competitive athlete (4), Weekend warrior (3)

    Reviewed by 13 customers

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    (2 of 3 customers found this review helpful)

     
    4.0

    I would buy this product again

    By lking125

    from Brighton. MI

    About Me Workout 6 days a week

    See all my reviews

    Verified Buyer

    Pros

    • Easy To Take
    • Good Value

    Cons

      Best Uses

      • During Workout
      • Pre-workout

      Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

      This product makes a difference in your workout if taken prior to working out, can take with additional supplements for better results.

      (2 of 3 customers found this review helpful)

       
      4.0

      Good Product

      By matthew.baskwell

      from Biloxi, MS

      About Me Competitive Athlete

      See all my reviews

      Pros

      • Easy To Take
      • Good Value

      Cons

        Best Uses

        • Daily Use

        Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

        This is a great product. I take it before workouts and before bed. I have not noticed any side effects and it has never disrupted me from falling asleep. Overall a good product for the price.

        (3 of 4 customers found this review helpful)

         
        4.0

        Great power

        By duebel.dehnelt

        from Charlotte NC

        About Me Weekend Warrior

        See all my reviews

        Verified Buyer

        Pros

        • Easy To Take
        • Good Value
        • Helps With Fatigue

        Cons

          Best Uses

          • Daily Use
          • Pre-workout

          Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

          Three in the morning, great power and endurance

          (1 of 2 customers found this review helpful)

           
          4.0

          Satisifed with product, don't take a bed

          By larson_lorne

          from Ohio

          See all my reviews

          Verified Buyer

          Pros

          • Good Value
          • Helps With Fatigue
          • Tastes Fine

          Cons

          • Has Side Effects

          Best Uses

          • Daily Use
          • Post-workout

          Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

          Decent product, pills slightly large, do not take a bed time they may contribute to not being able to fall asleep

          (1 of 2 customers found this review helpful)

           
          4.0

          This product rocks

          By gatorpka

          from Ocala, FL

          About Me Weekend Warrior

          See all my reviews

          Verified Buyer

          Pros

          • Easy To Take
          • Good Value

          Cons

            Best Uses

            • Daily Use
            • Pre-workout

            Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

            Take once a day

            (0 of 2 customers found this review helpful)

             
            4.0

            I would buy this product

            By bamamexico

            from Laredo, TX

            About Me Competitive Athlete

            See all my reviews

            Verified Buyer

            Pros

            • Easy To Take
            • Helps With Stress
            • Tastes Fine

            Cons

              Best Uses

              • Daily Use

              Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

              Easy to use.

              (3 of 5 customers found this review helpful)

               
              4.0

              Especially great for older guys

              By dwbost76

              from Concord, NC

              See all my reviews

              Verified Buyer

              Pros

              • Easy To Take
              • Good Value
              • Helps With Fatigue
              • Helps With Stress

              Cons

                Best Uses

                • Daily Use

                Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

                I take some right before bed to enhance natural HGH production.

                (1 of 2 customers found this review helpful)

                 
                4.0

                No bad feeling yet

                By derek_chen918

                from Columbus, OH

                See all my reviews

                Verified Buyer

                Pros

                • Easy To Take
                • Good Value
                • Helps With Fatigue
                • Helps With Immune System

                Cons

                  Best Uses

                  • Daily Use
                  • Pre-workout

                  Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

                  Every night before go to bed, take one pill let me feel easy to fall asleep

                  (1 of 3 customers found this review helpful)

                   
                  4.0

                  Works Great

                  By stsharff

                  from Seaford, DE

                  See all my reviews

                  Pros

                  • Works

                  Cons

                  • 4 pills daily

                  Best Uses

                  • Post-workout
                  • Pre-workout

                  Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

                  Pill will crumble if exposed to air, ie. pill case. I travel a lot and just leave it in the bottle that it comes in and all is well.

                  Trainer has me take 2 pre/post workout. 3 evenly spaced out during off days.

                  (4 of 4 customers found this review helpful)

                   
                  5.0

                  It Helps!

                  By psnaa2

                  from Las Vegas, NV

                  About Me Competitive Athlete

                  See all my reviews

                  Verified Buyer

                  Pros

                  • Easy To Take
                  • Good Value

                  Cons

                  • None

                  Best Uses

                  • Daily Use

                  Comments about GNC Pro Performance® L-Arginine L-Ornithine 2500:

                  At 40 years old I've been working out for more than half of my life. Even with all of the exercise & cardio that I do my family has a history of high cholesterol. I've been taking L-Arginine in both the powder & tablet form for some time now. After my last physical I was once again given a "great" bill of health. I attribute that to both my intense workouts and this suppliment. For the value you cannot beat GNC's combo L-Arginine / L-Ornithine tablet. I take it daily without fail.

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