Thorne L-Arginine, 120 Capsules (500 mg per Capsule) supplement bottle
Thorne

L-Arginine, 120 Capsules (500 mg per Capsule)

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 4 brand certifications checked · 4 retailers compared · Last updated: Mar 2026
75
Product Score Fair
90
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Arginine† 1 g *
Bioavailability Excellent

Absorption Rating

  • L-Arginine† Good
Other Ingredients Excellent

Fillers & Additives

  • High and low viscosity hydroxypropyl methylcellulose
  • Calcium laurate and magnesium citrate (Time-Sorb®†)
  • Hypromellose (Derived from Cellulose) Capsule
  • Leucine
  • Silicon Dioxide
Efficacy Very Poor

Dosage Analysis

  • L-Arginine† 1 g Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
L-Arginine† 1 g *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

High and low viscosity hydroxypropyl methylcellulose Unknown
Calcium laurate and magnesium citrate (Time-Sorb®†) Unknown
Hypromellose (Derived from Cellulose) Capsule Safe

It is used to encapsulate supplement ingredients.

Leucine Safe

It is used for its potential muscle-building and recovery benefits.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Price Comparison

iHerb $44.00 $0.73 / serving
Best Price
Vitacost $44.00 $0.73 / serving
Target $44.00 $0.73 / serving

Price History

Tracked across major retailers. Updated periodically.

$46$45$44$43$42 Mar 12 $44.00$44.00
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Thorne

Founded 1984 · New York, NY, United States · 161 products · thorne.com

Certifications

4 certifications
Consumerlab Verified
Nsf Certified For Sport Verified Source
Nsf Gmp Verified Source
Fda Gmp Inspections Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

2 incidents
Recall Captomer, Captomer-2502014-06-12Source
Prop 65 Lead2013-12-13Source
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Frequently Asked Questions
Is Thorne L-Arginine, 120 Capsules (500 mg per Capsule) a good supplement?

Thorne L-Arginine, 120 Capsules (500 mg per Capsule) received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients with 60 servings per container. Of the 5 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Thorne, holds a brand trust score of 90/100 with 4 verified certifications including Consumerlab, Nsf Certified For Sport, Nsf Gmp, Fda Gmp Inspections.

What are the ingredients in Thorne L-Arginine, 120 Capsules (500 mg per Capsule)?

Thorne L-Arginine, 120 Capsules (500 mg per Capsule) contains 1 active ingredients: L-Arginine† (1 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Thorne L-Arginine, 120 Capsules (500 mg per Capsule) safe to take?

Thorne L-Arginine, 120 Capsules (500 mg per Capsule) has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Thorne a trustworthy supplement brand?

Thorne receives a brand trust score of 90/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1984 and headquartered in New York, NY, United States, the company offers 161 products in their lineup. They hold 4 verified certifications including Consumerlab, Nsf Certified For Sport, Nsf Gmp, Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Thorne has 2 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.