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Doctors Best

Doctor's Best Sustained + Immediate Release L-Arginine 120 Tabs

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Doctor's Best Sustained + Immediate Release L-Arginine 120 Tabs

About Doctor's Best Sustained + Immediate Release L-Arginine

Doctor's Best Sustained plus Immediate Release L-Arginine contains this essential amino acid in a bilayer tablet, with two tablets providing 500 mg of sustained release and 500 mg of immediate release L-arginine in a formula that delivers enhanced blood levels. These tablets are specifically manufactured to immediately increase blood levels of L-arginine and then to sustain this beneficial increase continuously over an 8-hour period.

Research suggests that arginine supplementation helps increase muscle mass and may also positively beneficial in improving endurance as it a precursor to creatine, which helps supply energy to all cells of the body. L-arginine has been shown to support the cardiovascular system, heart function and improve overall circulation through its conversion to nitric oxide. 

  • Science-Based Nutrition™
  • Helps Boost Nitric Oxide (NO) Levels to Support Overall Cardiovascular Health
  • Dietary Supplement
  • Non-GMO / Gluten-Free / Soy-Free / Vegan 



  • Helps support athletic endurance*
  • Helps support recovery from athletic performance*
  • Helps boost nitric oxide (NO) levels to support overall cardiovascular health* 



Suggested Use: Take 2 tablets daily with food, or as recommended by a nutritionally-informed physician. 

Warnings: Not intended for individuals under the age of 18. Consult your physician if pregnant, nursing, have a medical condition, taking nitrates, warfarin, sildenafil (Viagra), medications for hypertension diabetes, or other supplement that may lower blood pressure while taking in concomitant with this product. Keep out of reach of children.

Store in a cool dry place. 


Nutrition Information

Doctor's Best Sustained + Immediate Release L-Arginine 120 Tabs

Serving Size: 2 Tablets

Servings Per Container: 60

Amount Per Serving 

  • L-Arginine
  • 1000 mg

   (as 500 mg immediate release and 500 mg sustained release

   from L-Arginine Alpha-Ketoglutarate)


Other Ingredients

Microcrystalline Cellulose, Stearic Acid, Silicon Dioxide, Magnesium Stearate (Vegetable Source), Croscarmellose Sodium, Hypromellose (coating). 


*While strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally ship with alternate packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and not rely solely on the information provided by .

*Always consult with a qualified healthcare professional prior to beginning any diet or exercise program or taking any dietary supplement. The content on our website is for informational and educational purposes only and is not intended as medical advice or to replace a relationship with a qualified healthcare professional.

*All specials and deals are while stocks last only. No rain checks.

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