Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

407 questions · 500 findings · 40 reviews

No studies found 115 · 23%GRADE not reported 185 · 37%Very low 89 · 17.8%Low 63 · 12.6%Moderate 36 · 7.2%High 12 · 2.4%

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Biofilm formation · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; ten included studies reported reduced or inhibited Streptococcus mutans biofilm formation with cranberry extract or fractions.

1 finding from 1 review

Grape seed extract or grape seed flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Cell damage or cytotoxicity · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; one included study reported very low cell damage with grape seed extract.

1 finding from 1 review

Cranberry extract / juice and proanthocyanidin (flavonoid) fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Antioxidant capacity · Streptococcus mutans (in vitro cultures and biofilms)

One study reported antioxidant activity of cranberry polyphenol fractions (ungraded).

1 finding from 1 review

Cranberry extract / juice and proanthocyanidin (flavonoid) fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

GtfB/C and F-ATPase activity · Streptococcus mutans (in vitro cultures and biofilms)

Cranberry proanthocyanidins downregulate GtfB/C and F-ATPase activity of S. mutans (5 studies; ungraded).

1 finding from 1 review

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Bacterial growth inhibition · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; seven included studies reported inhibition of Streptococcus mutans growth with cranberry extract or fractions.

1 finding from 1 review

Grape seed extract (GSE) and its proanthocyanidin fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Bacterial growth inhibition · Streptococcus mutans (in vitro cultures and biofilms)

Grape seed extract inhibits S. mutans growth in vitro (MIC ~0.5 mg/mL to 250 mg/mL across 5 studies; ungraded).

1 finding from 1 review

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Bacterial adhesion or initial colonization · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; three included studies reported reduced adhesion or initial colonization with cranberry extract or fractions.

1 finding from 1 review

Cranberry extract / juice and proanthocyanidin (flavonoid) fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Bacterial adhesion (inhibition) · Streptococcus mutans (in vitro cultures and biofilms)

Cranberry extract inhibits S. mutans adhesion / initial colonization in vitro (3 studies; ungraded).

1 finding from 1 review

Cranberry extract / juice and proanthocyanidin (flavonoid) fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Cell death / cytotoxicity induction · Streptococcus mutans (in vitro cultures and biofilms)

One study reported time-dependent cell-death induction (50% at 10 h) with cranberry extract (ungraded).

1 finding from 1 review

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Biofilm morphology or biomass · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; four included studies reported disrupted biofilm structure or reduced biomass with cranberry extract or fractions.

1 finding from 1 review

Grape seed extract or grape seed flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Bacterial adhesion · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; two included studies reported reduced Streptococcus mutans adhesion with grape seed extract or fractions.

1 finding from 1 review

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Antioxidant capacity · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; one included study reported antioxidant properties of cranberry fractions.

1 finding from 1 review

Bathing of the critically ill with chlorhexidine vs bathing with soap and water or non‐antimicrobial washcloths

Mortality (ICU, hospital) (days) · critically ill patients

It is very uncertain whether bathing of the critically ill with chlorhexidine changes mortality Data collected (where reported) in hospital, in the ICU,… compared with bathing with soap and water or non‐antimicrobial washcloths (very low certainty).

1 finding from 1 review