L-Arginine Supplements Review
Choose the Best L-Arginine Supplement. Find Out Which L-Arginine Supplement Passed CL's Tests.

Make sure you're choosing the best L-arginine supplements approved in our tests!
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Alphabetical list of L-arginine supplement brands compared in this review

Country Life L-Arginine Caps

Daily Wellness ArginMax- Women

Elements of Health Care L-Arginine Plus - Grape

GNC L-Arginine

Havasu Nutrition L-Arginine Extra Strength

MuscleTech L-Arginine SX-7 Black Onyx

NOW L- Arginine

PipingRock.com L-Arginine

Purethentic Naturals Premium Arginine
Puritan's Pride L-Arginine

Rexall L- Arginine

Solgar L-Arginine 500 mg

Spring Valley L- Arginine

Sundown Naturals L-Arginine 500 mg

Swanson Super Strength L-Arginine

The Vitamin Shoppe L-Arginine

Twinlab L-Arginine

Vitacost L- Arginine HCl

Vitamin World Maximum Strength L-Arginine
You must be a ConsumerLab.com member to get the full test results along with ConsumerLab.com's findings, recommendations, and quality ratings. You'll get results for 18 L-arginine supplements: ten selected by ConsumerLab.com and eight that passed the same testing in our voluntary Quality Certification Program. There's also information about one product that is similar to one which passed testing but is sold under a different brand name.
You'll get the following information about L-arginine supplements in this comprehensive review:
Which L-arginine supplements passed or failed testing
Which L-arginine supplements are the best value and CL's Top Picks
What L-arginine can and cannot do for your health
How forms of L-arginine ("free form," L-arginine HCl, and L-arginine-alpha-ketoglutarate) differ from one another
The dose of L-arginine for specific uses
What to look for on product labels and how to take L-arginine supplements
Why the amino acid citrulline is often added to L-arginine supplements and whether it's been shown to help
Cautions, side effects, and drug interactions with L-arginine
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