Doctor's Best Sustained-Release Niacin
vs
Douglas Laboratories Niacinimide 500 mg
Supplement Comparison

  • Vitamin B3 (Niacin): same total amount on both labels
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 2 nutrients compared
Bar chart: per-serving label amounts and listed forms for Doctor's Best Sustained-Release Niacin vs Douglas Laboratories Niacinimide 500 mg.

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Frequently asked questions

Which active ingredients does Doctor's Best Sustained-Release Niacin have?

  • Vitamin B3 (Niacin) appears as NiaXtend Niacin

Which active ingredients does Douglas Laboratories Niacinimide 500 mg have?

  • Vitamin B3 (Niacin) appears as Niacinamide

Which categories do Doctor's Best Sustained-Release Niacin and Douglas Laboratories Niacinimide 500 mg belong to?

  • Single Vitamin

What health concerns do Doctor's Best Sustained-Release Niacin and Douglas Laboratories Niacinimide 500 mg address?

  • Cholesterol Support
  • Metabolic Support
  • Heart & Cardiovascular Health
  • Energy & Metabolism
  • Skin, Hair & Nail Health

Which product has a higher amount of Vitamin B3 (Niacin) per serving?

  • Both products list the same total amount of Vitamin B3 (Niacin) per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Doctor's Best Sustained-Release Niacin: 1 tablet
    • Douglas Laboratories Niacinimide 500 mg: 1 capsule
  • Vitamin B3 (Niacin)
    • This supplement has 500 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg
  • Vitamin B3 (Niacin)
    • This supplement has 500 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg

Last updated: February 15, 2026

  • Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
  • We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
  • Transparency: We’re funded by our users. We don’t have sponsors or affiliate links, and we don’t sell supplements.
  • Editorial standards: we provide independent, impartial and objective data analysis.
  • This analysis is for educational purposes only. It is not a substitute for medical advice.
  • Questions? Read our Frequently Asked Questions or contact us, we’re here to help.
  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team