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.
Manganese
Selected research topic
Glucose and metabolic health
Confirmed comparison evidence for this topic is limited. The findings below retain their study conditions.
Some findings concern patients or people with a deficiency.
- Publications for this topic
- 3
- Human comparison publications
- 1
- Publications needing review
- 0
Findings in the studies
Risk of type 2 diabetes
Publications linked to this measurement: 2
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.
What the comparison group used was not confirmed.
Single ingredientMeasurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · Participant characteristics were not confirmed.
- Ingredients tested
- Single ingredient
- How results were compared
- Results were compared between groups.
- Measurement time
- Not confirmed.
- A result was reported, but the comparison could not be confirmed.Patient group · Single ingredient
Measurement and study conditions
- Study type
- Other evidence
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- Measurement time
- Not confirmed.
MetS
Publications linked to this measurement: 1
Review of existing studies · population needs confirmation
- A result was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: General population. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Highest versus lower exposure categories; pooled estimates were nonsignificant
- Measurement time
- Varied across observational studies
Representative outcome and study details
Human studies reported both an association and a result with no confirmed comparison group for Risk of type 2 diabetes.
These conditions come from related studies and may not describe a single paper.
Single-ingredient studies · Human studies · Includes patient groups · Population not specified · between-group comparison · comparator not confirmed
2 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 13.6 evidence score includes 0 independent human studies and 0 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: 50
Papers linked to this topic 3 · distinct papers 3 · papers with a confirmed human comparison 1 · 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.
- MetS: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Risk of type 2 diabetes: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 1
What the research found
Risk of type 2 diabetes
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Single ingredient · Unspecified population
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.
MetS
A result was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
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.
risk of type 2 diabetes
A result was reported, but the comparison could not be confirmed.
Other evidence · Single ingredient · Patient group
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 reviewed caution rules are available yet. Reported caution findings are shown below.
Findings to review with care
Side effects reported for the ingredient alone are separated from findings involving another supplement or medication.
Side effects reported with this ingredient alone
Symptoms or adverse events reported in studies without another active ingredient.
oxidative stress1 papers
Manganese exposure induces oxidative stress leading to mitochondrial dysfunction, inflammation, and cytotoxicity, contributing to neurotoxicity.Animal studies · Systematic reviewManganese-induced neurotoxicity1 papers
EFSA Panel established a safe intake level of 8 mg/day for adults based on limited data, noting manganese-induced neurotoxicity as the priority adverse effect.Human studies · Systematic reviewdopaminergic dysfunction1 papers
Exposure to manganese is associated with dopaminergic dysfunction and Parkinsonian-like symptoms, indicating neurotoxic effects.Human studies · Systematic reviewdevelopmental neurotoxicity1 papers
Manganese is identified as a developmental neurotoxicant in epidemiological studies.Human studies · Systematic reviewWorking memory1 papers
Manganese exposure at excess levels is associated with significant working memory deficits and other neurological dysfunctions.Human studies · Systematic reviewBrain oxidative stress1 papers
Manganese overexposure can lead to neurotoxic effects such as oxidative stress and inflammation in the brain.Human studies · Systematic reviewBrain1 papers
Manganese at high dietary intake may be neurotoxic, particularly to the brain.Human studies · Systematic review