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Sustained + Immediate Release L-Arginine 500mg

120 Tablets DRB-00200
  • Doctor’s Best Sustained Plus Immediate Release Arginine helps boost nitric acid (NO) levels to support overall cardiovascular health*

  • Helps support athletic endurance*

  • Helps support recovery from athletic performance*

  • Non-GMO
  • Gluten Free
  • Soy Free
  • Vegan
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Suggested Adult Use

Each serving contains 1000 mg of L-Arginine. Take 2 tablets daily without food.


The idea behind taking arginine away from food is that arginine may have to compete with other amino acids found in food for absorption. For example, lysine has been reported to compete with arginine's absorption in the intestine, as well as transport into cells. It also may compete for reabsorption in the renal tubules, resulting in increased arginine excretion (Gaby 2011).

Doctor's Best products can be found at vitamin specialty, chain and independent natural product stores across the country, as well as online. We recommend that you use our online Where to Buy store finder to find a store near you or one of our online partners who can ship to you directly.

Doctor's Best products are quality tested and manufactured in the United States using highly qualified cGMP manufacturers and raw material ingredients. Doctor's Best sources raw materials from around the world and ingredients are subject to the intense testing and verification regardless of geography of origin.