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
Stress and mood
The comparison is unconfirmed, so the findings cannot establish this ingredient’s effect.
Some publications still need interpretation checks and are kept separate from the findings below.
Some findings concern patients or people with a deficiency.
- Publications for this topic
- 3
- Human comparison publications
- 0
- Publications needing review
- 2
Findings in the studies
Depressive symptoms
Other human research, including observational studies and reviews
- A change was reported, but the comparison could not be confirmed.Patient group · Single ingredient
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Study comparison: selenium supplementation meta-analysis; abstract summary does not identify comparator
- Additional measurement information
- Primary outcome
- Measurement time
- Not confirmed.
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.Single ingredient
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Single ingredient
- Measurement time
- Not confirmed.
postpartum depression
Other human research, including observational studies and reviews
- A change was reported, but the comparison could not be confirmed.Patient group · Single ingredient
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Study comparison: observational association between high selenium intake and postpartum depression risk; association i
- Additional measurement information
- Secondary outcome
- Measurement time
- Not confirmed.
This result is held for interpretation. That does not mean research found no effect.
Outcome groups needing additional review (1)
- beck depression inventory · Distinct papers needing additional review: 1Evidence criteria check: 1
One paper can appear under multiple measured outcomes or review reasons, so these counts should not be added together.
Representative outcome and study details
Human studies reported a change with no confirmed comparison group in Depressive symptoms; while Studies with an unspecified organism reported a change with no confirmed comparison group in Depressive symptoms.
These conditions come from related studies and may not describe a single paper.
Single-ingredient studies · Human studies · Includes patient groups · comparator not confirmed
1 publications linked to this result
- Study conditions differ; results are shown descriptively and are not pooled.
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 3 · distinct papers 3 · comparison findings need further review · papers needing additional review 2
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.
- beck depression inventory: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Depressive symptoms: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- postpartum depression: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
depressive symptoms
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Patient group
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.
Depressive symptoms
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Patient group
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.
postpartum depression
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Patient group
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.
beck depression inventory
The study needs further checking before its result can be interpreted.
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.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
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.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
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.