Selenium
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Scientific evidence
Outcome-specific summaries with linked references or labelled research searches; review status is shown.
Professional perspectives
None published. Future perspectives require credential review; no verified professional badge is assigned automatically.
Member anecdotes
Personal experiences and questions, never clinical evidence or proof of safety or benefit.
Sponsored content
Must be visibly labelled and remains separate from evidence scores and independent rankings.
Goals & evidence
Marketing targets are not validated outcomes. Review status is shown on each summary; investigated doses are not personal recommendations.
Verified guidance · scientific evidence
Traceable source links; not personalized medical advice.
Unsupported marketing claim
Evidence summary & quality
Essential nutrient; additional cognitive benefit is not established for adequately nourished people
Evidence applies to a specific ingredient, form, population and outcome—not automatically to this product.
Relevant studied outcomes
Nutritional essentiality does not establish extra focus or cognitive benefit. Correcting deficiency is different from supplementing above dietary needs.
How it might work
Selenoproteins support antioxidant defense, thyroid hormone metabolism, DNA synthesis and reproduction.
Important limitation
Total intake and baseline nutritional status matter. An essential-nutrient claim cannot be extrapolated to nootropic efficacy.
Typical investigated dose / label context
Adult RDA: 55 mcg/day; adult tolerable upper intake level: 400 mcg/day. The sample contains 200 mcg. These nutrition values are not a cognitive trial dose or target.
Not dosing advice. Do not start, stop or change a supplement based on this summary. Confirm suitability and total intake with a qualified healthcare professional.
Safety & interactions. Excess selenium can be toxic. Count food and all supplements; 200 mcg is above the adult RDA and below the adult UL, not a target to reach.
Questions to ask a clinician or pharmacist
- Could my diet and other supplements push total selenium intake too high?
- Is the studied ingredient form and amount comparable with this label?
- Could this interact with my medicines, health conditions, pregnancy, nursing, or planned surgery?
- What would we use to judge benefit, and when should I stop or seek advice?
Read the sources
Reference pages and clearly labelled research searches. A search result is not a selected or endorsed paper.
- Selenium — Fact Sheet for Health Professionals
NIH Office of Dietary Supplements · Authoritative reference page
- Selenium and cognition trials/reviews
PubMed · Research search — not a specific paper or verified citation
What it is
An essential trace mineral used in selenoproteins involved in antioxidant defense and thyroid hormone metabolism.
What to compare
- Form (chelate, selenomethionine, sodium selenite) and elemental selenium per dose
- Independent third-party testing (identity, potency, heavy metals, microbes)
- Cost per matching active mg, not per capsule
- Tolerability and known side effects at this dose
Evidence grade: More established
Essentiality is well established; benefit of supplementing above dietary needs in people who are not deficient is not. Grades are qualitative editorial summaries, not formal systematic reviews.
⚑ 200 mcg is above the adult RDA (55 mcg) and below the tolerable upper intake level (400 mcg). Count selenium from other supplements and diet. Verify with a clinician, particularly if you take medications or are pregnant.
Best-in-class candidates
Entered by you, stored only in this browser. Not verified.
Ranking weights (30 / 30 / 25 / 15)
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