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Quercetin

Selected research topic

Blood pressure and vascular health

Some measured outcomes improved in human comparison studies. Read these findings with their populations and conditions.

Some findings concern patients or people with a deficiency.

Publications for this topic
5
Human comparison publications
1
Publications needing review
1

Findings in the studies

  • Systolic blood pressure

    Publications linked to this measurement: 2

    Human comparison research
    • A better result than the comparison group was reported.

      What the comparison group used was not confirmed.

      Patient group · Single ingredient
      Measurement and study conditions
      Study type
      Randomized controlled trial: subjects were randomly assigned to groups for comparison.
      Study population
      Human participants · Patient group
      Ingredients tested
      Single ingredient
      How results were compared
      Results were compared between groups.
      Measurement time
      Not confirmed.
    Review of existing studies · population needs confirmation
    • A result was reported, but the comparison could not be confirmed.
      Single ingredient
      Measurement and study conditions
      Study type
      Meta-analysis
      Study population
      Study subject not identified
      Ingredients tested
      Single ingredient
      Measurement time
      Not confirmed.

  • systolic

    Publications linked to this measurement: 1

    Other human research, including observational studies and reviews
    • A change was reported before and after use. Its cause cannot be isolated.
      Patient group · Single ingredient · after 28 days
      Measurement and study conditions
      Study type
      Randomized controlled trial: subjects were randomly assigned to groups for comparison.
      Study population
      Human participants · Patient group
      Ingredients tested
      Single ingredient
      How results were compared
      Changes within the same group were compared. · Study comparison: within-group post-quercetin changes by hypertension subgroup; no placebo contrast stated in result
      Measurement time
      after 28 days

  • diastolic BP

    Publications linked to this measurement: 2 (results in 1 need further review)

    Review of existing studies · population needs confirmation
    • A result 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
      How results were compared
      Study comparison: Pooled quercetin-supplementation results across placebo-controlled RCTs; result sentence does not st
      Additional measurement information
      Primary outcome
      Measurement time
      Not confirmed.

  • systolic BP

    Publications linked to this measurement: 2 (results in 1 need further review)

    Review of existing studies · population needs confirmation
    • A result 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
      How results were compared
      Study comparison: Pooled quercetin-supplementation results across placebo-controlled RCTs; result sentence does not st
      Additional measurement information
      Primary outcome
      Measurement time
      Not confirmed.
Representative outcome and study details

Partial research summary

Studies with an unspecified organism reported a result with no confirmed comparison group in diastolic BP.

These conditions come from related studies and may not describe a single paper.

Single-ingredient studies · Includes patient groups · comparator not confirmed

2 publications linked to this result (1 awaiting review included)

  • Study conditions differ; results are shown descriptively and are not pooled.
  • Some publications have not cleared source or interpretation review.
  • Some papers could not be reviewed, so this summary covers only findings that could be confirmed.
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 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: 89

Papers linked to this topic 5 · distinct papers 5 · papers with a confirmed human comparison 1 · papers needing additional review 1

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.

  • diastolic BP: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 0
  • systolic: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
  • Systolic blood pressure: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 1
  • systolic BP: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 0

What the research found

systolic

A change was reported before and after use. Its cause cannot be isolated.

Controlled study in people · Single ingredient · Patient group

Within-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.

systolic blood pressure

The study reported improvement in this measurement.

Controlled study in people · Single ingredient · Patient group

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.

diastolic BP

A result 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.

Systolic blood pressure

A result was reported, but the comparison could not be confirmed.

Meta-analysis · Single ingredient · Unspecified 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.

systolic BP

A result 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.

diastolic BP

The study needs further checking before its result can be interpreted.

Meta-analysis · Single ingredient · General population

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.

systolic BP

The study needs further checking before its result can be interpreted.

Meta-analysis · Single ingredient · General population

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 guides

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.

Side effects and combination studies

No side-effect or combination findings are available to show from the collected papers. This does not establish safety.