Improvement after a supplement is not the same as a comparative result
Start with the comparison. A before-and-after change alone cannot isolate the contribution of an ingredient.
Selenium
Selected research topic
Cardiovascular events
The confirmed comparison studies tested several ingredients together. They cannot isolate the effect of this ingredient.
Some findings concern patients or people with a deficiency.
- Publications for this topic
- 4
- Human comparison publications
- 2
- Publications needing review
- 0
Findings in the studies
Cardiovascular Mortality
Human comparison research
- Results were mixed for this outcome.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Deficiency group · Combination studyMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · Deficiency group
- Ingredients tested
- Ingredient combination
- How results were compared
- Results were compared between groups. · Study comparison: Selenium plus coenzyme Q10 versus placebo or no treatment within baseline selenium strata
- Additional measurement information
- Secondary outcome
- Measurement time
- 4-year supplementation; median follow-up 5.2 years
Other human research, including observational studies and reviews
- A change was reported, but the comparison could not be confirmed.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination studyMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- Measurement time
- Not confirmed.
Research with unclear study subject or type
- The study reported improvement in this measurement.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Combination studyMeasurement and study conditions
- Study type
- Review
- Study population
- Recorded population category: Deficiency group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Ingredient combination
- How results were compared
- Results were compared between groups. · Study comparison: Selenium yeast plus coenzyme Q10 versus placebo, as summarized by the review
- Additional measurement information
- Primary outcome
- Measurement time
- Four-year supplementation; cardiovascular mortality follow-up up to 12 years
CV mortality
- A better result than the comparison group was reported.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
General population · Combination studyMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · General population
- Ingredients tested
- Ingredient combination
- How results were compared
- Results were compared between groups. · Study comparison: selenium plus coenzyme Q10 vs placebo
- Measurement time
- 12-year follow-up after 4-year intervention
Representative outcome and study details
Human studies reported both mixed results and a change with no confirmed comparison group for Cardiovascular Mortality; while Studies with an unspecified organism reported between-group improvement in Cardiovascular Mortality.
These conditions come from related studies and may not describe a single paper.
combination-ingredient studies · Individual ingredient effects cannot be separated · Human studies · Includes patient groups and deficiency groups · between-group comparison · comparator not confirmed
3 publications linked to this result
- Study conditions differ; results are shown descriptively and are not pooled.
- Combination, formula, or class studies do not isolate this ingredient or establish synergy.
Data coverage and detailed study classifications
Paper counts are separated by research topic below. One paper may contribute to multiple findings.
Analysis status: Public-ready
Ingredient analysis date:
How the grade was determined: C
The 32.7 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The C tier remains conservative because of limited repetition across independent human clinical studies, too few clinical findings with an explicit effect direction.
The grade is based mainly on the research area with the most evidence. It does not mean the same result was found in other areas.
Papers linked to this ingredient overall: 51
Papers linked to this topic 4 · distinct papers 4 · papers with a confirmed human comparison 2 · papers needing additional review 0
A publication may appear in more than one count. These numbers should not be added. Ingredient-wide papers, topic-linked papers, and sources in outcome groups use different scopes. Adding source counts may count the same paper more than once.
- Cardiovascular Mortality: Sources represented in this measurement group: 3 · Distinct papers with human comparisons for this outcome: 1
- CV mortality: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
What the research found
cardiovascular mortality
Results for this measurement were mixed; no consistent conclusion can be drawn.
Controlled study in people · Ingredient combination · Deficiency group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
CV mortality
The study reported improvement in this measurement.
Controlled study in people · Ingredient combination · General population
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
cardiovascular mortality
The study reported improvement in this measurement.
Review · Ingredient combination · Deficiency group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Cardiovascular Mortality
A change was reported, but the comparison could not be confirmed.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
How to read research findings
How should I read research findings?
Research guidesNo clear difference and an uninterpretable result are different
A reported null comparison contains a result. An abstract without an interpretable comparison leaves a question unresolved.
Paper counts and study counts are different
Count original research separately from research that reanalyzes it. Publication volume is neither replication nor a quality rating.
Side effects and combination findings
Findings from this ingredient alone are shown separately from those involving another supplement or medication.
No combination cautions are available to show in the current data. This does not guarantee safety.
Review 3 combination findings and 0 findings that outperformed an ingredient alone.
Reported improvements with combinations
Combination findings are grouped by how the study compared them. This is not a recommendation to combine ingredients.
Combinations with reported improvement
The combination showed improvement, but each ingredient's contribution is unclear.
프로바이오틱스Co-supplementation with probiotics and selenium resulted in significant improvements in mental health, hormonal profiles, and oxidative stress markers compared to placebo.
코엔자임 Q10Combined supplementation with selenium and Coenzyme Q10 resulted in significantly improved renal function markers compared to placebo.
이노시톨Combined administration of myo-inositol and selenium significantly decreased TSH, TPOAb, and TgAb levels and enhanced thyroid hormones compared to baseline.