NOW Supplements L-Arginine 500 mg Nitric Oxide Precursor* Amino Acid 100 Veg Capsules
Analysis updated September 2026 · How Scout scores
At a glance
Summary
This supplement features L-Arginine, a beneficial amino acid known for enhancing blood flow and supporting cardiovascular health. The formulation is clean, with minimal additives such as hypromellose, stearic acid, and silicon dioxide, which are common and generally considered safe in supplements. The absence of artificial sweeteners, dyes, or proprietary blends contributes to its high score, reflecting a focus on ingredient quality and transparency.
Key ingredients 4
L-ArginineGood
L-Arginine is an amino acid that serves as a precursor to nitric oxide, which can enhance blood flow and improve cardiovascular health. It is a high-quality active ingredient commonly used in supplements for its potential to support exercise performance and recovery. The ingredient is well-regarded for its role in protein synthesis and immune function.
Risks
Excessive intake may lead to gastrointestinal discomfort or interact with certain medications.
Benefits
Supports cardiovascular health and may improve exercise performance by enhancing blood flow.
HypromelloseNeutral
Hypromellose is a cellulose-based compound used as a capsule material, providing a vegetarian alternative to gelatin. It is considered neutral as it does not contribute any nutritional value or significant health risks. The ingredient is widely used in supplements for its stability and safety profile.
Benefits
Provides a vegetarian-friendly capsule option without significant nutritional benefits.
Stearic AcidNeutral
Stearic Acid is a fatty acid used as a lubricant in supplement manufacturing, derived from vegetable sources. It is considered neutral as it does not have significant health impacts at the levels used in supplements. The ingredient is generally recognized as safe and does not affect the quality of the active ingredients.
See more about Stearic Acid →Silicon DioxideNeutral
Silicon Dioxide is used as an anti-caking agent to prevent clumping in powdered supplements. It is considered neutral as it does not provide nutritional benefits or pose significant health risks. The ingredient is commonly used in food and supplements for its functional properties.
See more about Silicon Dioxide →Processing
Unprocessed or Minimally Processed Foods
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