Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

234 questions · 320 findings · 14 reviews · All outcomes

No studies found 82 · 25.6%GRADE not reported 176 · 55%Very low 54 · 16.9%Low 5 · 1.6%Moderate 3 · 0.9%High 0 · 0%

Cranberry extract / juice and proanthocyanidin (flavonoid) 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)

Cranberry extract inhibits S. mutans growth in vitro (MIC ~0.5-60 mg/mL across 7 studies; ungraded).

1 finding from 1 review

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

Bacterial cell death · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; one included study reported time- and concentration-dependent bacterial-count reduction with cranberry extract.

1 finding from 1 review

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

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

No meta-analysis was conducted; two included studies reported reduced microcolonies or altered bacterial structure with grape seed extract.

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

Grape seed extract inhibits S. mutans adhesion to hydroxyapatite in vitro (2 studies; ungraded).

1 finding from 1 review

Grape seed extract or grape seed 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; five included studies reported inhibition of Streptococcus mutans growth with grape seed 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)

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

Cranberry extract reduces S. mutans biofilm formation in vitro (10 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)

pH drop / acidogenicity buffering · Streptococcus mutans (in vitro cultures and biofilms)

Cranberry extract reduces S. mutans acidogenicity / glycolytic pH drop in vitro (5 studies; ungraded).

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)

Gtf activity · Streptococcus mutans (in vitro cultures and biofilms)

One study reported grape seed extract inhibits S. mutans Gtf activity (ungraded).

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)

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

One study reported high antioxidant capacity of grape seed extract (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)

Biofilm morphological changes · Streptococcus mutans (in vitro cultures and biofilms)

Cranberry extract alters S. mutans biofilm morphology/architecture (4 studies; ungraded).

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)

Biofilm morphological changes · Streptococcus mutans (in vitro cultures and biofilms)

Grape seed extract alters S. mutans biofilm morphology (2 studies; ungraded).

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)

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

Grape seed extract reduces S. mutans biofilm formation in vitro (5 studies; ungraded).

1 finding from 1 review

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