Life Extension Super Selenium Complex
vs
NOW Foods Selenium
Supplement Comparison

  • Selenium: Life Extension Super Selenium Complex has 2.0× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 4 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Super Selenium Complex vs NOW Foods Selenium.

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Frequently asked questions

Which active ingredients does Life Extension Super Selenium Complex have?

  • Vitamin E appears as d-Alpha Tocopheryl Acid Succinate
  • Selenium appears as Se-Methyl L-Selenocysteine L-selenomethionine Sodium Selenite

Which active ingredients does NOW Foods Selenium have?

  • Selenium appears as L-Selenomethionine

Which categories do Life Extension Super Selenium Complex and NOW Foods Selenium belong to?

  • Single Mineral

What health concerns do Life Extension Super Selenium Complex and NOW Foods Selenium address?

  • Antioxidant Support
  • Thyroid Support
  • Healthy Aging & Longevity
  • Immune System Support
  • General Health

Which product has a higher amount of Selenium per serving?

  • Life Extension Super Selenium Complex has the highest total amount of Selenium: 200 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Super Selenium Complex: 1 capsule
    • NOW Foods Selenium: 1 tablet
  • Vitamin E
    • This supplement has 20.1 mg
    • Recommended Dietary Allowance in men: 15 mg
    • Recommended Dietary Allowance in women: 15 mg
    • Tolerable Upper Intake Level: 1000 mg
  • Selenium
    • This supplement has 200 mcg
    • Recommended Dietary Allowance in men: 55 mcg
    • Recommended Dietary Allowance in women: 55 mcg
    • Tolerable Upper Intake Level: 400 mcg
  • Selenium
    • This supplement has 100 mcg
    • Recommended Dietary Allowance in men: 55 mcg
    • Recommended Dietary Allowance in women: 55 mcg
    • Tolerable Upper Intake Level: 400 mcg

Last updated: February 13, 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.
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  • Author: VIOscan Research Team