L-Arginine
Scored by the Formulate Research Team · Last reviewed July 2026
Overview: Thorne L-Arginine
Maintain healthy blood pressure and support optimal blood flow with sustained-release L-arginine* L-Arginine – Sustained Release supports blood flow to the extremities to benefit heart health, exercise capacity, collagen formation, and sexual wellness.*
Score Breakdown
Formulate scores every product across six weighted dimensions. Each dimension is graded independently — hover or tap to see what drove each component.
Ingredients per Serving
Certifications & Testing
Other Ingredients
Calcium Laurate, High and Low Viscosity Hydroxypropyl Methylcellulose, Leucine, Magnesium (Citrate), Silicon Dioxide
Recommended Use
Take 2 capsules two times daily or as recommended by your health-care practitioner.
Warnings
ALLERGY WARNING This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients. PREGNANCY If pregnant, consult your health-care practitioner before using this product. INTERACTIONS Individuals with a known herpes infection should not take L-arginine without also taking lysine, as L-arginine alone has been noted to cause herpes eruptions in susceptible
Frequently Asked Questions
What is Thorne L-Arginine's Formulate score?
Thorne L-Arginine scores 80 out of 100 (grade A-) on Formulate's ingredient-level rubric, which weighs evidence quality, dose accuracy, bioavailability, transparency, safety, and manufacturing practices.
Is Thorne L-Arginine worth it?
Thorne L-Arginine scores 80/100 (grade A-). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in Thorne L-Arginine?
Each serving contains L-Arginine (2 g). Serving size: 2 Capsules. 60 servings per container.
How do I take l-arginine?
Take 2 capsules two times daily or as recommended by your health-care practitioner.
Who makes L-Arginine?
L-Arginine is made by Thorne. See Formulate's full grade and product lineup for Thorne on its brand page.
Is Thorne L-Arginine third-party tested?
Thorne lists the following certifications and testing for this product: NSF Certified, Gluten Free, Dairy Free, Soy Free, Thorne Verified, Natural Flavors, Natural Colors, GMP Certified.
Related Supplements
Track l-arginine in your stack
Build a personalized supplement stack free in your browser — no install. Flag dose overlaps and interactions, and keep every product scored against the latest evidence.
Is L-Arginine right for your goals?
Two questions, then every ingredient graded against what you're actually trying to do — plus what it costs per effective dose.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.