Arginine & Ornithine
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
Hypromellose, Stearic Acid
Recommended Use
Suggested usage: Take 2 capsules daily as needed, preferably with juice or water on an empty stomach, before exercise or at bedtime.
Warnings
Caution: For adults only. Keep out of reach of children. Do not use if history of myocardial infarction or established coronary artery disease. Consult physician if pregnant/nursing, taking medication, or have a medical condition (including herpes and/or glaucoma). Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that
Frequently Asked Questions
What is NOW Foods Arginine & Ornithine's Formulate score?
NOW Foods Arginine & Ornithine 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 Arginine & Ornithine worth it?
NOW Foods Arginine & Ornithine 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 Arginine & Ornithine?
Each serving contains L-Arginine (1 g), L-Ornithine (500 mg). Serving size: 2 Capsule(s). 125 servings per container.
How do I take arginine & ornithine?
Suggested usage: Take 2 capsules daily as needed, preferably with juice or water on an empty stomach, before exercise or at bedtime.
Who makes Arginine & Ornithine?
Arginine & Ornithine is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods Arginine & Ornithine 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.