L-Lysine
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, Microcrystalline Cellulose, Rice Flour
Recommended Use
Suggested Usage: Take 1 capsule 1 to 3 times daily.
Warnings
Caution: For adults only. Keep out of reach of children. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Frequently Asked Questions
What is NOW Foods L-Lysine's Formulate score?
NOW Foods L-Lysine scores 80 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-Lysine worth it?
NOW Foods L-Lysine 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 NOW Foods L-Lysine?
Each serving contains L-Lysine (500 mg). Serving size: 1 Veg Capsule(s). 250 servings per container.
How do I take l-lysine?
Suggested Usage: Take 1 capsule 1 to 3 times daily.
Who makes L-Lysine?
L-Lysine is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods L-Lysine 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.