L-Arginine Powder
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
Recommended Use
Suggested usage: Mix 2 level teaspoons daily as needed in at least 8 oz. of juice or water, preferably on an empty stomach.
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 L-Arginine Powder's Formulate score?
NOW Foods L-Arginine Powder scores 88 out of 100 (grade A) 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 L-Arginine Powder worth it?
NOW Foods L-Arginine Powder scores 88/100 (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 NOW Foods L-Arginine Powder?
Each serving contains L-Arginine (6 g). Serving size: 6 Gram(s). 76 servings per container.
How do I take l-arginine powder?
Suggested usage: Mix 2 level teaspoons daily as needed in at least 8 oz. of juice or water, preferably on an empty stomach.
Who makes L-Arginine Powder?
L-Arginine Powder is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods L-Arginine Powder third-party tested?
NOW Foods lists the following certifications and testing for this product: Vegan, Vegetarian, Gluten-Free, Dairy-Free.
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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.