Double Strength L-Arginine
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
Certifications & Testing
Other Ingredients
Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid, Croscarmellose Sodium, Silicon Dioxide, Hypromellose, Calcium Carbonate, Glycerin
Recommended Use
Suggested Usage: Take 1 tablet twice daily as needed. Take between meals or at bedtime with at least 8 oz. of water or juice to facilitate absorption.
Warnings
Caution: Take this product with at least 8 oz. of water or juice. For adults only. Keep out of reach of children. Not for pregnant or nursing women. Consult physician if taking medication (especially antihypertensives, anticoagulants, and antidiabetic drugs), have a medical condition (especially asthma or renal disease) or are planning to have surgery. This product should be avoided by persons wit
Frequently Asked Questions
What is NOW Foods Double Strength L-Arginine's Formulate score?
NOW Foods Double Strength L-Arginine scores 71 out of 100 (grade B) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is NOW Foods Double Strength L-Arginine worth it?
NOW Foods Double Strength L-Arginine scores 71/100 (grade B). That's an above-average result — most of its doses and ingredient forms are well-chosen, with only minor gaps in dosing, transparency, or testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in NOW Foods Double Strength L-Arginine?
Each serving contains L-Arginine (1 g). Serving size: 1 Tablet(s). 120 servings per container.
How do I take double strength l-arginine?
Suggested Usage: Take 1 tablet twice daily as needed. Take between meals or at bedtime with at least 8 oz. of water or juice to facilitate absorption.
Who makes Double Strength L-Arginine?
Double Strength L-Arginine is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods Double Strength L-Arginine third-party tested?
NOW Foods lists the following certifications and testing for this product: Vegan, Vegetarian, Gluten-Free, Dairy-Free.
Related Supplements
Track double strength 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 Double Strength 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.