Sustained Release

L-Arginine

350mg
L-Arginine
L-Arginine
L-Arginine
L-Arginine
L-Arginine

Sustained Release

L-Arginine
350mg


An amino acid that may help maintain healthy blood vessel function, optimal blood flow, endothelial health, and blood pressure in the normal range. 

At-a-Glance

  • Helps maintain healthy blood pressure in the normal range*
  • Supports cardiovascular health and blood vessel function*
  • Promotes healthy nitric oxide production*
  • Features sustained-release delivery for optimal absorption

Product Description

L-Arginine Sustained Release (SR) is an advanced dietary supplement designed for adults interested in overall cardiovascular health, including maintaining healthy blood pressure in the normal range.* 

L-Arginine SR features the amino acid L-Arginine in a unique vegetable-based wax matrix that releases L-Arginine gradually. An optimal blood level of L-Arginine is critical for vascular health. Your endothelium – the layer of cells that line your blood vessels – relies on this amino acid for a healthy production of nitric oxide. In turn, nitric oxide plays a key role in vascular health, including promoting blood vessel relaxation and optimal blood flow.*

L-Arginine SR and its ability to support blood vessel health is ideally suited for athletes, active adults and others interested in maintaining healthy blood vessel function. Adults interested in overall health can benefit from L-Arginine SR as well. L-Arginine – one of the body’s most metabolically versatile amino acids – also plays a role in immune health, detoxification, protein synthesis, hormone regulation, male fertility, and more.*.

  • No salt, starch, preservatives, artificial color or flavorings
  • Free of common allergens (milk, egg, fish, shellfish, tree nuts, peanuts, wheat and soy)
  • Convenient, easy-to-swallow tablets

* 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

Frequently Asked Questions

What can you expect?

L-Arginine SR is a unique dietary supplement specially formulated for adults to support vascular health, including healthy blood vessel function.*

How does it work?

Each tablet dissolves slowly for a steady release of L-Arginine over 4 to 6 hours. This promotes optimal absorption and tissue retention without an excessive amount of Arginine typically found in regular immediate-release forms.*

How do you take it?

As a dietary supplement for adults, take three (3) tablets twice daily, preferably with meals, or as directed by your healthcare practitioner. It is normal for this product to have a distinctive botanical aroma.

Are there any precautions?

Consult your healthcare professional prior to use if you have or suspect a medical condition, are taking any medications, or are nursing or pregnant. As with all dietary supplements, keep out of reach of children.

What product quality control tests are performed?

L-Arginine SR is manufactured in the United States (Oregon) in a state-of-the-art, FDA-registered facility that meets or exceeds current Good Manufacturing Practices (cGMP). Quality control tests are performed at every stage of the manufacturing process from rigorous raw material testing to finished product testing.


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$36.99
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Order by phone 800-483-2532
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Providing high-quality
sustained-release supplements
since 1978


Only What You Need

sustained-release

No salt, sugar, starch, artificial colors or flavorings, or preservatives

Easy to Swallow

The shape and size of our tablets make it easy for you to take your supplements

Backed by Science

Backed by a portfolio of
clinical research



An amino acid that may help maintain healthy blood vessel function, optimal blood flow, endothelial health, and blood pressure in the normal range. 

At-a-Glance

  • Helps maintain healthy blood pressure in the normal range*
  • Supports cardiovascular health and blood vessel function*
  • Promotes healthy nitric oxide production*
  • Features sustained-release delivery for optimal absorption

Product Description

L-Arginine Sustained Release (SR) is an advanced dietary supplement designed for adults interested in overall cardiovascular health, including maintaining healthy blood pressure in the normal range.* 

L-Arginine SR features the amino acid L-Arginine in a unique vegetable-based wax matrix that releases L-Arginine gradually. An optimal blood level of L-Arginine is critical for vascular health. Your endothelium – the layer of cells that line your blood vessels – relies on this amino acid for a healthy production of nitric oxide. In turn, nitric oxide plays a key role in vascular health, including promoting blood vessel relaxation and optimal blood flow.*

L-Arginine SR and its ability to support blood vessel health is ideally suited for athletes, active adults and others interested in maintaining healthy blood vessel function. Adults interested in overall health can benefit from L-Arginine SR as well. L-Arginine – one of the body’s most metabolically versatile amino acids – also plays a role in immune health, detoxification, protein synthesis, hormone regulation, male fertility, and more.*.

  • No salt, starch, preservatives, artificial color or flavorings
  • Free of common allergens (milk, egg, fish, shellfish, tree nuts, peanuts, wheat and soy)
  • Convenient, easy-to-swallow tablets

* 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

Frequently Asked Questions

What can you expect?

L-Arginine SR is a unique dietary supplement specially formulated for adults to support vascular health, including healthy blood vessel function.*

How does it work?

Each tablet dissolves slowly for a steady release of L-Arginine over 4 to 6 hours. This promotes optimal absorption and tissue retention without an excessive amount of Arginine typically found in regular immediate-release forms.*

How do you take it?

As a dietary supplement for adults, take three (3) tablets twice daily, preferably with meals, or as directed by your healthcare practitioner. It is normal for this product to have a distinctive botanical aroma.

Are there any precautions?

Consult your healthcare professional prior to use if you have or suspect a medical condition, are taking any medications, or are nursing or pregnant. As with all dietary supplements, keep out of reach of children.

What product quality control tests are performed?

L-Arginine SR is manufactured in the United States (Oregon) in a state-of-the-art, FDA-registered facility that meets or exceeds current Good Manufacturing Practices (cGMP). Quality control tests are performed at every stage of the manufacturing process from rigorous raw material testing to finished product testing.

Sustained-Release that Lasts All Day

Phase 1
Phase 2
Phase 3
Phase 4
Phase 5
  • 1st Hour
  • 2nd Hour
  • 3rd Hour
  • 4th Hour
  • 5th Hour
  • 6th Hour


Long Lasting

sustained-release

Releases over time for optimal absorption

Saves You Money

sustained-release

More absorption
= less waste

Inspired by Your Body

sustained-release

Mimics how your body naturally processes food

Reduces Side Effects

sustained-release

Gentle and
gradual release



extended-release

Customer Reviews

Based on 55 reviews
95%
(52)
4%
(2)
0%
(0)
2%
(1)
0%
(0)
J
JESUS FIGUEROA

L-Arginine 350mg Sustained Release

w
wallace seeman Seeman
Endurance products

I like l-arginine as I do all the products I purchase from Endurance-

R
Robert Robertson
L-Argenine

Been using it for years. Really does the job on relaxing the arteries. High BB? You’ll win by combining this product with routine exercise, proper diet and a good attitude!

J
John Connolly

L-Arginine 350mg Sustained Release

J
John Montero
Thank you

I have received the product, I will not be able to review just yet I will wait till I have been using for at least 30 days, for results.

Customer Reviews

Based on 55 reviews
95%
(52)
4%
(2)
0%
(0)
2%
(1)
0%
(0)
J
JESUS FIGUEROA

L-Arginine 350mg Sustained Release

w
wallace seeman Seeman
Endurance products

I like l-arginine as I do all the products I purchase from Endurance-

R
Robert Robertson
L-Argenine

Been using it for years. Really does the job on relaxing the arteries. High BB? You’ll win by combining this product with routine exercise, proper diet and a good attitude!

J
John Connolly

L-Arginine 350mg Sustained Release

J
John Montero
Thank you

I have received the product, I will not be able to review just yet I will wait till I have been using for at least 30 days, for results.