Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets
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
Rice Bran, Carnauba Wax, Stearic Acid, Magnesium Stearate, Silica
Recommended Use
Suggested Adult Use: Take 1 tablet daily with food, or as recommended by a nutritionally informed physician.
Warnings
Warning: If you are pregnant, nursing, have a medical condition, or taking medication, consult your physician before taking this product. Temporary flushing such as warmth, itching or redness of the skin, are common side effects that may occur upon initial use. These effects may worsen if you drink alcohol or hot beverages shortly after taking niacin. Do not take more than 500 mg per day (one tabl
Frequently Asked Questions
What is Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets's Formulate score?
Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets scores 93 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 Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets worth it?
Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets scores 93/100 (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 Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets?
Each serving contains Niacin (500 mg). Serving size: 1 Tablet(s). 120 servings per container.
How do I take sustained-release niacin with niaxtend, 500 mg, 120 tablets?
Suggested Adult Use: Take 1 tablet daily with food, or as recommended by a nutritionally informed physician.
Who makes Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets?
Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets is made by Doctor's Best. See Formulate's full grade and product lineup for Doctor's Best on its brand page.
Is Doctor's Best Sustained-Release Niacin with niaXtend, 500 mg, 120 Tablets third-party tested?
Doctor's Best lists the following certifications and testing for this product: Non-GMO, Gluten-Free, Vegan, Vegetarian, 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.