NOW Foods Selenium, 100 mcg, 250 Tablets supplement bottle
NOW Foods

Selenium, 100 mcg, 250 Tablets

What We Researched
1 active ingredient analyzed · 2 inactive ingredients decoded · 7 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
100
Product Score Excellent
100
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Selenium (elemental) (from 20 mg L-Selenomethionine) 100 mcg 182%
Bioavailability Excellent

Absorption Rating

  • Selenium (elemental) (from 20 mg L-Selenomethionine) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Stearic Acid (Vegetable Source) and Magnesium Stearate (Vegetable Source)
Efficacy Excellent

Dosage Analysis

  • Selenium (elemental) (from 20 mg L-Selenomethionine) 100 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Selenium (elemental) (from 20 mg L-Selenomethionine) 100 mcg 182%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Stearic Acid (Vegetable Source) and Magnesium Stearate (Vegetable Source) Generally_safe

They are used to prevent ingredients from sticking to manufacturing equipment.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$13$12$11$10$9 Mar 12 $11.01
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
NOW Foods

Founded 1968 · Bloomingdale, Illinois, USA · 996 products · nowfoods.com

Certifications

7 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Non Gmo Project Verified Source
Npa Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

7 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.NoneSource
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023Source
Prop 65 Lead2021-11-30Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21Source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015Source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12Source
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Frequently Asked Questions
Is NOW Foods Selenium, 100 mcg a good supplement?

NOW Foods Selenium, 100 mcg, 250 Tablets received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients Of the 2 inactive ingredients, 1 are rated safe and 0 are flagged for review. The manufacturer, NOW Foods, holds a brand trust score of 100/100 with 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project.

What are the ingredients in NOW Foods Selenium, 100 mcg?

NOW Foods Selenium, 100 mcg contains 1 active ingredients: Selenium (elemental) (from 20 mg L-Selenomethionine) (100 mcg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Foods Selenium, 100 mcg safe to take?

NOW Foods Selenium, 100 mcg, 250 Tablets has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is NOW Foods a trustworthy supplement brand?

NOW Foods receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Bloomingdale, Illinois, USA, the company offers 996 products in their lineup. They hold 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: NOW Foods has 7 historical regulatory incidents on record, which are factored into the trust score.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.