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Selenium 200 mcg

product on market Capsule 21st Century Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 100% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · grounded in 1 source · methodology

Selenium is an essential mineral that supports thyroid function and antioxidant defenses. There is strong evidence regarding its role in protecting cells from oxidative stress. However, overall evidence coverage for this specific formulation remains limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Selenium 200 mcg
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Capsule(s)
Serving Size
60
Servings
Mineral
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

200 mcg (364% DV)
3.6× RDA — above typical dose (UL: 0.4 mg) 173 studies (A:0, B:67)

Other Ingredients

Rice Bran Brewer's Yeast Oat Fiber Gelatin Magnesium Stearate
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Directions: As a mineral supplement, adults take one (1) capsule daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage.

Warnings & Precautions

Do not exceed recommended dosage.

Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.

Stop use and contact a physician if adverse reactions occur.

Keep out of reach of children.

Do not use if product appears to be tampered with or seal is broken.

Formulation Notes

No added Sugar, Preservatives, Artificial Flavors, or Colors.

Antioxidant Support

Gluten free

Selenium is an antioxidant nutrient and a mineral the body needs.

Additional Information

Individual results may vary.

Store at room temperature.

Guaranteed quality Laboratory tested

Metadata

Product Details

UPC / SKU7 40985 21154 0
DSLD Entry Date2021-12-18
Product TypeMineral
FormCapsule
Brand21st Century
DSLD ID258555
Data Updated2026-04-11
Research

Research Evidence

273
Research Sources
55
Avg Quality
131
Meta Analysis
61
Systematic Review
55
Rct
19
Clinical Trial
2
Regulatory Source
1
Cochrane Review
1
Other
1
Observational
1
Openfda Safety
A Selenium for preventing cancer
Meta Analysis The Cochrane database of systematic reviews 2018 PubMed DOI
A Selenium supplementation for the primary prevention of cardiovascular disease
Meta Analysis The Cochrane database of systematic reviews 2013 PubMed DOI
A Selenium supplementation for critically ill adults
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin E and the risk of prostate cancer: the Selenium and Vitamin E Cancer Prevention Trial (SELECT)
Rct JAMA 2011 PubMed DOI
B Selenium and prostate cancer: systematic review and meta-analysis
Meta Analysis The American journal of clinical nutrition 2012 PubMed DOI
B Selenium supplementation for Hashimoto's thyroiditis
Systematic Review The Cochrane database of systematic reviews 2013 PubMed DOI
B Pharmacological interventions for preventing dry mouth and salivary gland dysfunction following radiotherapy
Meta Analysis The Cochrane database of systematic reviews 2017 PubMed DOI
B Selenium, antioxidants, cardiovascular disease, and all-cause mortality: a systematic review and meta-analysis of randomized controlled trials
Meta Analysis The American journal of clinical nutrition 2020 PubMed DOI
B The effect of selenium supplementation on coronary heart disease: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) 2017 PubMed DOI
B Meta-analysis of selenium effects on the meat quality of broilers
Meta Analysis Poultry science 2024 PubMed DOI
View all evidence for Selenium →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.