NAC
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, Citric Acid, Microcrystalline Cellulose
Recommended Use
Suggested Usage: Take 1 capsule twice daily.
Warnings
Caution: For adults only. Keep out of reach of children. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Do not eat freshness packets enclosed. 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 NAC's Formulate score?
NOW Foods NAC scores 89 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 NAC worth it?
NOW Foods NAC scores 89/100 (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 NAC?
Each serving contains Selenium (25 mcg), N-Acetyl Cysteine (600 mg). Serving size: 1 Capsule(s). 250 servings per container.
How do I take nac?
Suggested Usage: Take 1 capsule twice daily.
Who makes NAC?
NAC is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods NAC third-party tested?
NOW Foods lists the following certifications and testing for this product: 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.