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.
Zinc
Selected research topic
Nutrient status
Confirmed comparison evidence for this topic is limited. The findings below retain their study conditions.
Some publications still need interpretation checks and are kept separate from the findings below.
- Publications for this topic
- 4
- Human comparison publications
- 0
- Publications needing review
- 2
Findings in the studies
glycated hemoglobin
Research with unclear study subject or type
- The study reported improvement in this measurement.Single ingredient · dose ≥25 mg/day
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: General population. Whether the research involved humans needs confirmation.
- Ingredients tested
- Single ingredient
- How results were compared
- Results were compared between groups. · Study comparison: zinc supplements versus placebo; high-dose subgroup
- Additional measurement information
- Biomarker
- Measurement time
- dose ≥25 mg/day
umbilical cord blood zinc concentrations
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.pregnancy
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Observational zinc status association with birth weight
- Additional measurement information
- Biomarker
- Measurement time
- pregnancy
This result is held for interpretation. That does not mean research found no effect.
Outcome groups needing additional review (1)
- zinc deficiency prevalence · Distinct papers needing additional review: 1Direction unclear: 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
Studies with an unspecified organism reported between-group improvement in glycated hemoglobin.
Single-ingredient studies · between-group comparison
1 publications linked to this result
- Route, form, dose, or population details are incomplete, so the findings cannot be confirmed as directly comparable.
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: B
The 61.4 evidence score includes 2 independent human studies and 2 clinical studies in the representative benefit area. The B tier remains conservative because of limited repetition across independent human clinical studies, limited repeated evidence for directly felt outcomes.
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: 58
Papers linked to this topic 4 · distinct papers 4 · 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.
- glycated hemoglobin: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- umbilical cord blood zinc concentrations: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- zinc deficiency prevalence: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
glycated hemoglobin
The study reported improvement in this measurement.
Meta-analysis · Single ingredient · General population
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.
umbilical cord blood zinc concentrations
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · 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.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Controlled study in people · Separable contribution · Unspecified population
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.
zinc deficiency prevalence
The study needs further checking before its result can be interpreted.
Meta-analysis · Unknown intervention · Deficiency group
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
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.
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.
Review 1 combination findings and 0 findings that outperformed an ingredient alone.
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.
vomiting occurrence within 30 minutes after administration1 papers
Lower doses of zinc (5-10 mg/day) significantly reduced vomiting within 30 minutes of administration compared with 20 mg/day in children with acute diarrhea.Human studies · Randomized controlled trialReported 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.
마그네슘Co-supplementation with magnesium oxide and zinc sulfate resulted in significant improvements in glycemic control, lipid profiles, and inflammatory markers compared to placebo.