Related Compounds
Compounds connected by the same goals, effects, or research topics.
Compound Profile
Selenium
No consistent benefit in cancer prevention; essential for deficiency.
Use extra caution — High doses toxic (selenosis). Details
Last reviewed: •2 sources citedReport a correctionProfile-wide ·A Strong
At a glance
From this profile's structured data- Evidence
- Grade A
- Safety
- High doses toxic (selenosis).
- Profile context
- selenoproteins, glutathione peroxidase, thyroid hormone metabolism
Next stepsWhere to go next — guides & comparisons
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Quick stats
- Evidence level
- Strong evidence
- Typical onset
- Varies by prep
- Safety rating
- Use extra caution: Use caution
- Best for
- Selenoproteins, Glutathione Peroxidase, Thyroid Hormone Metabolism
- Avoid / review if
- Avoid Excessive Supplementation.
Safety
Safety & Cautions
High doses toxic (selenosis).
High caution
Caution level: High. Multiple caution categories apply, or the record uses avoid/contraindication language.
Evidence Summary
Profile-wide ·A StrongEvidence lens
Most useful for practical interpretation when safety context also fits.
StrongStrong evidence
Human clinical evidence: Present in source signals
Mechanistic / preclinical: Mechanism mapped — Metabolic Regulation · Selenoprotein Dependent Antioxidant Defense · Oxidative Stress Modulation
Research maturity: Established research — main contexts: Selenoproteins · Glutathione Peroxidase · Thyroid Hormone Metabolism
Safety boundary: Safety note available — High doses toxic (selenosis).
This profile cites 2 human studies.
Evidence Strength
Confidence estimate based on the design quality and consistency of published clinical trials.
Selenium has a strong evidence rating.
AdaptogenStress & MoodLongevity
Citation density
0.7
Sources
2
Effects
3
Research recency
Mixed recency
Evidence Grade
Grade A: Strong Evidence
Evaluation of methodological rigor, population reach, and evidence alignment.
- Design Match
- Meta analysis
- Risk of Bias
- Low
- Consistency
- Not assessed
Strongest recorded design is a meta analysis, drawn from 4 recorded studies, 2 in people.
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
- Strong
- Multiple RCTs, consistent direction, adequate effect size
- Moderate
- Some RCTs or consistent observational data in humans
- Preliminary / Mixed
- Animal or in-vitro only, or conflicting human data
- Traditional / Theoretical
- Traditional use only; no controlled human trials
Clinical Study Summaries (2)1 human evidence source · 0 human trials · Participant totals not consistently reported · Consistency not yet classifiable
Filter by study class
Showing 2 of 2 studies.
What the evidence actually shows
This table contains 2 structured sources, including 1 human evidence source; 0 are human trials. A reliable participant total cannot be calculated because sample size is not consistently structured in the cited sources. Source-to-conclusion relationships are not classified in this structured set, so consistency is not yet classifiable.
Profile-wide evidence grade: see the profile grade above · Confidence: not separately assigned
What would change our conclusion?
Larger, well-controlled human trials using comparable populations, doses, preparations, and clinically meaningful outcomes could materially strengthen or weaken this conclusion. Replication in a different population or a high-quality synthesis resolving current disagreement could also materially change confidence.
| Study | Design | N | Dose | Duration | Population | Outcome | Result & magnitude | Source |
|---|---|---|---|---|---|---|---|---|
PubMed · Am J Clin Nutr · 2003 Background | Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies. | — | — | — | — | — | — | PubMed → |
Apoptosis by dietary agents for prevention and treatment of prostate cancer PubMed · Endocr Relat Cancer · 2010 Background | Narrative review Summarizes selected literature without the full prespecified search and selection methods of a systematic review. | — | — | — | — | — | — | PubMed → |
How Selenium Works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Selenium Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Dosing
- Common form
- chelated mineral capsule or powder
- No standardized dose
- Our source data records the usual product form for this ingredient but no studied dose. Preparations differ widely, so follow the standardization on the product you actually have and speak to a clinician before starting.
Mechanisms & biological pathways
Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.
- Metabolic Regulation
- Selenoprotein Dependent Antioxidant Defense
- Oxidative Stress Modulation
- Hormonal Signaling Context
- Immune Function Support
- Thyroid Hormone Metabolism Modulation
Guides that use Selenium
Condition guides
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Safety checks and cautions relevant to this decision.
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Compare & Sourcing
Compare side-by-side tradeoffs or verify active marker guidelines.
Review available sources for Selenium
Independent database mapping — evaluated separately from safety and efficacy scores.
Affiliate disclosure: Shopping links may earn this site a commission at no cost to you. Links are chosen on quality and availability, never commission tiers; safety warnings and evidence ratings stay independent.
Related alternatives
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Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
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Compound profile context
How to interpret Selenium
Selenium compound profile with evidence context, key research topics, source notes, safety context, and references presented in an evidence-first format. Use this compound profile to understand mechanism, evidence quality, and practical safety context before comparing products or building a stack. A biochemical pathway connection can be useful for discovery, but it is not the same as proven benefit in humans.
When reviewing Selenium, separate the active molecule from the product category around it. Dose form, absorption, extract standardization, medication interactions, and individual sensitivity can change the real-world risk-benefit picture.
For supplement planning, avoid combining multiple compounds with overlapping sedating, stimulating, serotonergic, blood-pressure, anticoagulant, or liver-metabolism effects unless a qualified clinician has reviewed the context.