L-Arginine Sustained Release - Featuring AjiPure

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These days, more and more health conscious individuals are adding L-arginine to their nutritional regimen for everyday cardiovascular maintenance. The problem is, L-arginine doesn't last very long in the body—roughly one hour—which can limit the effectiveness of conventional L-arginine supplements. Swanson Ultra Pharmaceutical Grade AjiPure 1,000 mg L- Arginine solves this dilemma with state-of-the- art, sustained-release tablets that deliver the nutrient gradually over an eight-hour period for round-the-clock circulatory support.


Supplement Facts

Serving Size 1 Sustained-Release Tablet

Servings Per Container 90

Amount Per Serving % Daily Value
AjiPure® Pharmaceutical Grade L-Arginine (from L-Arginine HCl) 1 g *

*Daily Value not established.

Other Ingredients: Hydroxypropyl cellulose, stearic acid, xanthan gum, pharmaceutical glaze, magnesium stearate, silica.

Suggested Use: As a dietary supplement, take one sustained-release tablet two to three times per day with water.

Warning: For adults only. Not intended for use by children or pregnant or nursing women. Consult your healthcare provider before use if you have a renal or liver disease. Reduce dosage if you experience nausea, abdominal cramps or diarrhea.

Storage Instructions: Keep out of reach of children. Do not use if seal is broken. Store in a cool, dry place.

Trademark Information: AjiPure® and the AjiPure® logo are registered trademarks of Ajinomoto, Inc.




  1. How does L-arginine support nitric oxide production?
    L-arginine is an amino acid the body uses to produce nitric oxide through a natural enzymatic process. By serving as the direct precursor to nitric oxide, L-arginine helps support healthy circulation, blood flow, and exercise performance.
  2. What is nitric oxide, and why is it important?
    Nitric oxide is a molecule naturally produced by the body that helps blood vessels relax and widen, supporting healthy circulation. It also helps deliver oxygen and nutrients to working muscles and other tissues, making it important for cardiovascular health and physical performance.
  3. How is L-arginine different from L-citrulline?
    L-arginine is the direct precursor to nitric oxide, while L-citrulline is converted into L-arginine in the body before contributing to nitric oxide production. Because they support the same pathway through different mechanisms, both amino acids are popular ingredients in circulation and exercise support supplements.
  4. What does "pharmaceutical grade" mean?
    For Swanson L-Arginine Sustained Release, "pharmaceutical grade" refers to the exceptionally high purity and quality standards used to manufacture the AjiPure® L-arginine ingredient. Produced through a plant-based fermentation process, AjiPure is manufactured under strict quality controls to deliver a highly purified amino acid with consistent quality from batch to batch. The term describes the ingredient's manufacturing standards and does not mean the product is a pharmaceutical drug.
  5. Is Swanson L-Arginine Sustained Release suitable for special diets?
    Swanson L-Arginine Sustained Release is made with non-GMO ingredients and is formulated without dairy. This product is not suitable for vegan or vegetarian lifestyles and is not formulated or certified to be gluten-free. Individuals with dietary restrictions or sensitivities should review the ingredient list before use.